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Valter MARIANI PRIMIANI

Pubblicazioni

Valter MARIANI PRIMIANI

 

262 pubblicazioni classificate nel seguente modo:

Nr. doc. Classificazioni
164 4 Contributo in Atti di Convegno (Proceeding)
86 1 Contributo su Rivista
8 2 Contributo in Volume
3 6 Brevetti
1 5 Altro
Anno Risorsa
2019 Multi-sensor platform for real time measurements of honey bee hive parameters
IOP Conference Series: Earth and Environmental Science
Autore/i: Cecchi, S.; Terenzi, A.; Orcioni, S.; Spinsante, S.; Mariani Primiani, V.; Moglie, F.; Ruschioni, S.; Mattei, C.; Riolo, P.; Isidoro, N.
Editore: Institute of Physics Publishing
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266895 Collegamento a IRIS

2018 Experimental Comparison Between Source Stirring and Mechanical Stirring in a Reverberation Chamber by Analyzing the Antenna Transmission Coefficient
2018 International Symposium and exhibition on Electromagnetic Compatibility - EMC EUROPE 2018
Autore/i: De Leo, A.; Cerri, G.; Russo, P.; Mariani Primiani, V.
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this paper the result of a wide set of measurements based on scattering parameters, performed on a novel type of reverberation chamber are presented. Two stirring actions are considered: the first one is the traditional mechanical stirring, obtained by rotating a Z-folded metallic paddle; the second technique is realized by inserting two of monopoles into the chamber's wall and subsequently varying their position, so changing the electromagnetic field configuration inside the cavity. A statistical analysis of the scattering parameters is reported, so the chamber is characterized by a wide set of parameters.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/261993 Collegamento a IRIS

2018 Experimental Validation of an Analytical Model for the Design of Source-Stirred Chambers
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: DE LEO, Alfredo; Cerri, Graziano; Russo, Paola; MARIANI PRIMIANI, Valter
Classificazione: 1 Contributo su Rivista
Abstract: A low-frequency experimental characterization of a multiple monopole-source-stirred reverberation chamber is presented and the results are compared to the prediction of an analytical model. At first quality factor was determined, then the statistic of the received power and Rician K-factor as well as the electric field uniformity and anisotropy. All the experimental results are in good agreement with the prediction of the analytical model, demonstrating its accuracy in designing a source-stirring chamber.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251696 Collegamento a IRIS

2018 PERFORMANCES ESTIMATION AND MEASUREMENT OF A SOURCE STIRRED REVERBERATION CHAMBER
PROCEEDINGS OF THE XXII RINEM
Autore/i: DE LEO, Alfredo; Cerri, Graziano; Russo, Paola; MARIANI PRIMIANI, Valter
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this paper, the performances of a source stirred reverberation chamber in considered: in particular, the multiple monopoles stirring technique was considered. An array of antennas was placed onto chambers’ walls and they were fed in two at time and changing the fed pair also the electromagnetic field configuration varies, so achieving the properties of uniformity, randomness and isotropy that allows to use the chamber as the measurement environment for an immunity test according to the standard EN6 1000-4-12, 2011. The performances of the chamber based on source stirring technique were compared to the most traditional stirring technique, the mechanical stirring obtained by a rotating paddle. This comparison was made by analyzing the result of numerical simulations, compared to the statistical analysis of a wide set of measurements.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266644 Collegamento a IRIS

2018 Effect of graphene oxide and metallic fibers on the electromagnetic shielding effect of engineered cementitious composites
JOURNAL OF BUILDING ENGINEERING
Autore/i: Mazzoli, A.; Corinaldesi, V.; Donnini, J.; Di Perna, C.; Micheli, D.; Vricella, A.; Pastore, R.; Bastianelli, L.; Moglie, F.; Mariani Primiani, V.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255936 Collegamento a IRIS

2018 Over-the-Air Tests of High-Speed Moving LTE Users in a Reverberation Chamber
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Autore/i: Micheli, Davide; Barazzetta, Massimo; Diamanti, Riccardo; Obino, Pietro; Lattanzi, Renzo; Bastianelli, Luca; Mariani Primiani, Valter; Moglie, Franco
Classificazione: 1 Contributo su Rivista
Abstract: High-speed trains are nowadays a reality in most countries. Internet services and connectivity are required by the passengers on board using smartphones and laptops. Nevertheless, the higher the speed, the bigger the issues that operators have to face to implement mobility and to reduce the effect of fast fading signal and Doppler shift, which may cause throughput reduction and problems to access the network. In the past, operators tried to optimize the cellular access to UMTS cells covering railways. Now that 4G networks have become mature and deployed, a similar approach needs to be optimized and implemented to LTE cells covering the same targets. We present the results of a testing campaign replicating real “high speed train” propagation scenarios, like a train running in open space or in tunnels with the help of a reverberation chamber. The chamber was partially filled by absorbing panels and equipped with rotating stirrers in order to approach the multipath propagation and to replicate the fading conditions that is typical of smartphones in a train coach. The effects of Doppler and its fast variations are presented, together with an analysis of the efficiency of different transmission solutions for tunnels (single input single output – SISO – cells propagating inside them). The testing sessions were performed under a collaboration program between Telecom Italia (in the paper referred as “operator”), Nokia Networks and Università Politecnica delle Marche. After the experiments in our laboratory, some features were introduced in the operator’s live network, covering the high-speed railway between the two Italian cities of Piacenza and Bologna.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252568 Collegamento a IRIS

2018 On the Estimated Measurement Uncertainty of the Insertion Loss in a Reverberation Chamber Including Frequency Stirring
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: Gifuni, Angelo; Bastianelli, Luca; Migliaccio, Maurizio; Moglie, Franco; Mariani Primiani, Valter; Gradoni, Gabriele
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, we present an improved model of measurement standard uncertainty of the insertion loss in a reverberation chamber (RC), including frequency stirring. Differently from the previous model, the enhanced one does not require specific conditions on the parameter to be measured. Such an enhancement is applicable for all usable measurement conditions in RCs. Moreover, a majorant is derived, that is obtained under a weak condition on the coefficient of variation of the parameter to be measured. Results from measurements support the validity of both the proposed enhancement and the majorant.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266064 Collegamento a IRIS

2018 Shielding Effectiveness of Randomly Distributed Conductive Elements: Experimental Analysis and Simplified Model
IEEE International Symposium on Electromagnetic Compatibility
Autore/i: Bastianelli, Luca; Moglie, Franco; Mariani Primiani, Valter
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The shielding effectiveness of cementitious composites loaded by conductive fibers exhibits a particular frequency behavior that differs a lot from the case of powder fillers. The effects is ascribed to the random distribution of the conductive fibers inside the mortar that form a sort of grid with random side. Furthermore, contact among each fibers is not perfect and characterized by both a resistive and a capacitive nature. Some measurement data obtained by the nested reverberation chamber method are shown, and a simplified model is presented to predict such frequency behavior.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266063 Collegamento a IRIS

2018 Base-Case Model for Measurement Uncertainty in a Reverberation Chamber Including Frequency Stirring
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: Gifuni, Angelo; Bastianelli, Luca; Moglie, Franco; Mariani Primiani, Valter; Gradoni, Gabriele
Classificazione: 1 Contributo su Rivista
Abstract: We address the uncertainty of reverberation chamber (RC) measurements in presence of both mechanical and frequency stirring (FS). A base-case model is derived for reverberation fields affected by the measurement uncertainty due to the lack of a perfect statistical uniformity of fields in a RC. It is found that the measurement uncertainty associated with the FS depends on both the total uncorrelated samples and the local insertion loss (IL). The local IL depends on the frequency stirring bandwidth (FSB). The model allows us for obtaining separate measurement uncertainty contributions. Measurements support the achieved uncertainty model. In particular, results show that the dependence on the IL is normally rather weak also when very wide FSBs are used.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251805 Collegamento a IRIS

2018 Experimental Analysis of the Aging Effects on Shielding Effectiveness of Cementitious Composites
2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity, EMC, SI and PI 2018
Autore/i: Bastianelli, Luca; Primiani, Valter Mariani; Moglie, Franco; Donnini, Jacopo; Mazzoli, Alida; Corinaldesi, Valeria; Gradoni, Gabriele; Micheli, Davide
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The shielding effectiveness of cementitious composites is analyzed by means of the nested reverberation chamber method. This feature is evaluated as function of time in order to estimate the aging effects. Different cementitious mixtures are considered and carbon/metallic fibers are put within the mortar in order to improve the shielding effectiveness considering the frequency band from 0.8 GHz up to 8.4 GHz
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266049 Collegamento a IRIS

2018 Applicability of Measurement Uncertainty Models in a Reverberation Chamber Including Frequency Stirring
2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity, EMC, SI and PI 2018
Autore/i: Gifuni, Angelo; Migliaccio, Maurizio; Bastianelli, Luca; Moglie, Franco; Primiani, Valter Mariani; Gradoni, Gabriele
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We analyze the uncertainty of measurements carried out in a reverberation chamber. The adopted model includes the frequency stirring method and different K-Factor values. Two majorants are proposed to enhance the uncertainty computation of the chamber insertion loss.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266048 Collegamento a IRIS

2018 Correlation matrix methods to assess the stirring performance of electromagnetic reverberation chambers
WAVE MOTION
Autore/i: Gradoni, Gabriele; Moglie, Franco; Mariani Primiani, Valter
Classificazione: 1 Contributo su Rivista
Abstract: The use of correlation matrices to evaluate the number of uncorrelated stirrer positions of electromagnetic reverberation chambers has widespread applications in electromagnetic compatibility. We present a review of recent methods based on multivariate correlation functions that relates statistical inhomogeneities in space (frequency) to the reduction of uncorrelated cavity configurations. Full wave finite-difference time domain simulations of an actual reverberation chamber are performed through an in-house parallel code. The efficiency of this code allows for capturing extensive inhomogeneous/anisotropic reverberation fields at frequencies close to the lowest usable frequency (LUF) of the chamber. The concept of effective independent position is revised in light of random sampling and a model-driven relation with the probability distribution of correlation matrix entries is used to take into account spatial (frequency) inhomogeneities. Driven by extensive simulation data, an empirical probability density function is found for the correlation matrix elements to be non-central t-student distributed with asymmetry increasing towards low frequencies.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264933 Collegamento a IRIS

2017 Low-Frequency Theoretical Analysis of a Source-Stirred Reverberation Chamber
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: DE LEO, Alfredo; MARIANI PRIMIANI, Valter; Russo, Paola; Cerri, Graziano
Classificazione: 1 Contributo su Rivista
Abstract: Theoretical analysis of a reverberation chamber excited through the source-stirring technique at low frequency is presented. A complete analytical solution returns quickly the electromagnetic field inside the chamber thanks to an efficient computation technique for the slowly convergent triple series. The stirring function is accomplished by 62 monopole antennas, irregularly distributed on the chamber walls, and subsequently, fed two at a time for a total of 1891 combinations. At first, the empty chamber is characterized, as usually it is done for any test site and then a receiving loop is considered in the chamber working volume to simulate a device under test (DUT) and the induced voltage is studied in terms of amplitude and phase. The analytical approach allows to account for all mutual couplings between transmitting antennas and the receiving structure through the computation of all self and mutual impedances. We demonstrate that the contribution of chamber irrotational modes cannot be neglected in the computation of both antenna input impedance and DUT-induced voltage. The present study highlights the capability of source stirring to change the field amplitude and orientation in the undermoded condition. This advantage takes also benefit from the use of an out-of-phase feeding for each pair of active antennas, achieving a higher DUT-induced voltage.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/239310 Collegamento a IRIS

2017 Numerical analysis of a reverberation chamber: Comparison between mechanical and source stirring techniques
2017 International Symposium on Electromagnetic Compatibility - EMC EUROPE 2017
Autore/i: De Leo, A.; Primiani, V. Mariani; Russo, P.; Cerri, G.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252509 Collegamento a IRIS

2017 ELECTROMAGNETIC PROPERTIES OF CARBON NANOTUBE REINFORCED CONCRETE COMPOSITES FOR FREQUENCY SELECTIVE SHIELDING STRUCTURES
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Micheli, D.; Vricella, A.; Pastore, R.; Delfini, A.; Buneno Morles, R.; Marchetti, M.; Santoni, F.; Bastianelli, L.; Moglie, F.; Mariani Primiani, V.; Corinaldesi, V.; Mazzoli, A.; Donnini, J.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/240471 Collegamento a IRIS

2017 Testing of the Carrier Aggregation Mode for a Live LTE Base Station in Reverberation Chamber
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Autore/i: Micheli, Davide; Barazzetta, Massimo; Carlini, Camillo; Diamanti, Riccardo; Mariani Primiani, Valter; Moglie, Franco
Classificazione: 1 Contributo su Rivista
Abstract: For the first time, the carrier aggregation feature of a live 4G-LTE base station (BS) is checked adopting a reverberation chamber as a propagating environment. To that purpose, two non adjacent bands were chosen: 800 and 1800 MHz and alternatively set as primary and secondary cells. The multipath conditions were tuned by adding the absorbing material inside the chamber and ranging from an empty condition with a rich multipath to a real environment like an indoor scenario. The latter is a very interesting and popular situation as it represents one in which people use mobile phones. The multipath variation effect on the BS performance was accurately verified by introducing power compensation in order to account for the variation of the chamber quality factor Q due to the insertion of absorbers. A complete over-the-air test was carried out by checking typical transmission quality parameters, that are of interest to manufacturers and mobile network operators. Results highlight differences between the performance of the two bands as a function of multipath degree and signal strength.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236361 Collegamento a IRIS

2017 High performance FDTD simulations for chaotic electromagnetic environments
2017 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications, NEMO 2017
Autore/i: Moglie, Franco; Bastianelli, Luca; Gradoni, Gabriele; Mariani Primiani, Valter
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The performance of our FDTD code is analyzed in two HPC systems. A reverberation chamber is fully simulated and the statistical analysis reveals how the introduction of hemisphere scatters improves the chaotic nature of the random electromagnetic fields generated by the cavity, with particular emphasis on low frequencies.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251803 Collegamento a IRIS

2017 Reverberation chambers a la carte: An overview of the different mode-stirring techniques
IEEE ELECTROMAGNETIC COMPATIBILITY MAGAZINE
Autore/i: Serra, R.; Marvin, A. C.; Moglie, F.; Mariani Primiani, V. ; Cozza, A.; Arnaut, L. R.; Huang, Y.; Hatfield, M. O.; Klingler, M.; Leferink, F.
Classificazione: 1 Contributo su Rivista
Abstract: Reverberation chambers (RC), a name inspired in room acoustics, are also known in literature as reverberating, reverb, mode-stirred or mode-tuned chambers. In their basic form, they consist of a shielded metallic enclosure, forming a cavity resonator, together with some mode-stirring mechanism. The main goal of such stirring mechanism is to generate an amplitude-varying electromagnetic field that is ideally statistically uniform.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/248492 Collegamento a IRIS

2017 Stirring performance of helically distributed paddles
Proceedings of Electromagnetic Compatibility & Signal/Power Integrity (EMCSI)
Autore/i: Creta, Valerio; Bastianelli, Luca; Moglie, Franco; MARIANI PRIMIANI, Valter; Arnaut, LUK RAF
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The performance of a rotating stirrer made of helically positioned paddles is experimentally analyzed. The statistically independent positions are computed as a function of the number of paddles, paddle separation and relative tilt angle. With respect to a traditional single paddle wheel stirrer, the structure combines a helical path and just a simple engine required for the rotation. The analysis reveals an improvement in the lower frequency range where the chamber performance is more critical. The number of the paddles is limited by the distance and the tilt angle. The correlation between two adjacent paddles is also analyzed as function of the distance and the tilt angle. The activity suggests the need for optimization of all parameters.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251777 Collegamento a IRIS

2017 Full wave analysis of chaotic reverberation chambers
2017 32nd General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2017
Autore/i: Bastianelli, L.; Gradoni, G.; Moglie, F.; Primiani, V. Mariani
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this paper, we study possible ways to improve the Reverberation Chamber (RC) behavior. There could be benefits in deforming the RC rectangular geometry of the baseline cavity by inserting spherical diffractors into the RC or by titling the walls of the RC. We demonstrate that increased field disorder and randomization can be achieved with both the asymmetric structures in presence of the same mechanical stirrer. It is found that the improvement is prominent at low frequencies, with respect to the lowest usable frequency (LUF), which is consistent with results obtained by other investigators on similar RC structures. Numerical Finite-Difference Time-Domain (FDTD) simulations are performed to demonstrate the field chaoticity improvement in terms of both uncorrelated excitation frequencies and stirrer configurations.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266065 Collegamento a IRIS

2017 Reverberation chambers deformed by spherical diffractors
Proceedings of the 2017 International Symposium on Electromagnetic Compatibility - EMC EUROPE
Autore/i: Bastianelli, Luca; Moglie, Franco; Primiani, Valter Mariani; Gradoni, Gabriele
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Numerical FDTD full-wave simulations are performed in order to evaluate the behavior of a chaotic reverberation chamber. Performances are evaluated in terms of uncorrelated frequencies and antenna positions by using a correlation-based multivariate approach. The chaotic cavity geometry is obtained by including spherical diffractors inside the chamber. It is demonstrated that wall deformations enhance field uncorrelation and disorder within the investigated frequency range, including relatively low frequency of operation, thus assisting source stirring.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252020 Collegamento a IRIS

2017 Reverberation chambers for testing LTE wireless communication systems
Proceedings of Electromagnetics in Advanced Applications (ICEAA)
Autore/i: Bastianelli, Luca; Gradoni, Gabriele; Micheli, D.; Barazzetta, M.; Diamanti, R.; Moglie, Franco; MARIANI PRIMIANI, Valter
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Reverberation chambers are successfully adopted to test last generation wireless communication systems. The aim is the replication of realistic propagation condition in outdoor and indoor situations where the multipath contribution statistically overlaps to the direct path between the base station and the user terminal. The insertion of quantified absorbing materials allows to tune the power delay profile, the Rician K-factor, and the coherence bandwidth according to real life situations.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251586 Collegamento a IRIS

2017 Helical Stirring for Enhanced Low-Frequency Performance of Reverberation Chambers
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: Arnaut, Luk R.; Moglie, Franco; Bastianelli, Luca; Mariani Primiani, Valter
Classificazione: 1 Contributo su Rivista
Abstract: A novel class of volumetric mechanical mode stirring methods is introduced. One particular type, denoted as helical stirring, combines rotation and translation in a single motion. This technique is implemented, and its measured performance is compared to conventional circular stirring by the same paddle. It is observed that helical stirring can significantly increase the number of uncorrelated stir states at sufficiently low frequencies. Higher maximum- and lower minimum-to-average ratios of the magnitude and intensity of the received field are obtained that are traceable to a heavier tail of their probability density functions. While the helix pitch can be optimized per frequency, suboptimal values also yield considerable improvement. The use of a stir matrix facilitates the data analysis and estimation of ensemble statistics for arbitrary values of the helix pitch, beyond its experimentally realized discrete values.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/245096 Collegamento a IRIS

2017 A Comparison Between Different Reception Diversity Schemes of a 4G-LTE Base Station in Reverberation Chamber: A Deployment in a Live Cellular Network
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: Barazzetta, Massimo; Micheli, Davide; Bastianelli, Luca; Diamanti, Riccardo; Totta, Matteo; Obino, Pietro; Lattanzi, Renzo; Moglie, Franco; MARIANI PRIMIANI, Valter
Classificazione: 1 Contributo su Rivista
Abstract: The uplink performance of a real fourth-generation long-term-evolution (LTE) frequency-division multiplexing base station was observed by adopting a reverberation chamber as propagating environment. In the downlink direction, the reception of the LTE signal is limited to mobile station receivers. On the other hand, different reception schemes could be implemented by the base station in the uplink direction. Interference rejection and coordinated multipoint reception criteria are based on spatial diversity and are analyzed in a rich multipath environment. These options could be susceptible to impairments due to the presence of Gaussian noise, also including the more realistic case of a discontinuous noise source. The testing session was carried out under a collaboration program between TIM S.p.A., Nokia, and Università Politecnica delle Marche, and it ended up by introducing envisioned reception solutions of the base station in a live customer’s cellular network.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/245679 Collegamento a IRIS

2016 Optimization techniques for source stirred reverberation chambers
International Symposium on Electromagnetic Compatibility - EMC EUROPE 2016
Autore/i: De Leo, Alfredo; Russo, Paola; Cerri, Graziano; Mariani Primiani, Valter
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The aim of this paper is to propose optimization techniques for source stirred reverberation chambers. In particular, the stirring function is accomplished by 62 monopole antennas distributed on the chamber walls, and subsequently fed two at a time for a total of 1891 combinations. At first it is shown how an irregular placement of the antenna increases the chamber performances. Subsequently, an optimization algorithm based on the cumulative distribution function (CDF) is presented and the obtained results are evaluated in terms of statistical uniformity. Finally, the analytical formulation for the correlation matrix of the electromagnetic fields distribution due to all the couples of monopoles is introduced. Combining these two techniques, it is possible to reduce the number of the fed antenna pairs and improving the chamber performances.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/240756 Collegamento a IRIS

2016 Shielding effectiveness statistical evaluation of random concrete composites
2016 IEEE International Workshop on Metrology for AeroSpace (MetroAeroSpace) Proceedings
Autore/i: Bastianelli, Luca; Capra, Sofia; Gradoni, Gabriele; Micheli, Davide; Vricella, Antonio; Corinaldesi, Valeria; Mazzoli, Alida; Moglie, Franco; Mariani Primiani, Valter
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The shielding performance of random concrete composite samples are checked under a random excitation. It is achieved by means of a nested reverberation chamber system. Metallic fibers are randomly diffused in the concrete in order to improve shielding effectiveness from less than 10 dB up to an averaged value of 35 dB within a frequency range that includes communication system operating bands.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236362 Collegamento a IRIS

2016 IMMUNITY TEST SIMULATION IN A MULTIPLE ANTENNA SOURCE STIRRED REVERBERATION CHAMBER
PROCEEDINGS OF THE XXI RINEM
Autore/i: DE LEO, Alfredo; Cerri, Graziano; Russo, Paola; MARIANI PRIMIANI, Valter
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Multiple antenna source stirring is an alternative technique to realize a reverberation chamber: in the proposed case, 62 monopoles are distributed on the chamber walls and fed two at time, so achieving 1891 combinations. The electromagnetic field distribution and the self and mutual impedances are analytically determinable, and statistics can be predicted through the computation of Cumulative Distribution Functions and Polar Plots. The model can be also extended to simulate an immunity test by inserting a DUT inside the working volume of the chamber. Both a monopole and a loop are analytically modeled to simulate common and differential mode noise. It must be highlighted that all mutual coupling among the transmitting antennas and the DUT are accounted for, in terms of mutual impedances. In the lower frequency range, undermoded condition, the technique takes benefit from the adoption of an out-of-phase feeding of each active couple of antennas that enhances field strength
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266645 Collegamento a IRIS

2016 Optimization of 4G wireless access network features by using reverberation chambers: Application to high-speed train LTE users
European Microwave Week 2016: "Microwaves Everywhere", EuMW 2016 - Conference Proceedings; 46th European Microwave Conference, EuMC 2016
Autore/i: Barazzetta, Massimo; Micheli, Davide; Diamanti, Riccardo; Bastianelli, Luca; Moglie, Franco; Primiani, Valter Mariani
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A real 4G base station connected to live network of Telecom Italia and radiating into a reverberation chamber is used to investigate performances of fast moving terminals on board of high-speed trains. The results concern a testing campaign by replicating real high speed train propagation scenarios, like the train running in open space or in tunnels, with the aid of a reverberation chamber. This is partially filled by absorbing materials in order to approach the multipath propagation that is typical of a train coach, and equipped with two rotating paddels in order to replicate the signal fluctuations that are typical for the mentioned environments. The effects of Doppler shift and its fast variations are presented, together with an analysis of the efficiency of different transmission solutions for tunnels.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266066 Collegamento a IRIS

2016 Ballistic and electromagnetic shielding behaviour of multifunctional Kevlar fiber reinforced epoxy composites modified by carbon nanotubes
CARBON
Autore/i: Micheli, D; Vricella, A.; Pastore, R.; Delfini, A.; Giusti, A.; Albano, M.; Marchetti, M.; Moglie, F.; Mariani Primiani, V.
Classificazione: 1 Contributo su Rivista
Abstract: Overall goal of the research is to develop a material simultaneously able to absorb mechanical shocks and shield from electromagnetic interferences. Several layered composite materials aimed at such multi-functionality have been conceived and realized: the characterization has been carried out in terms of electromagnetic shielding effectiveness in the range 0.8–8.0 GHz and of energy absorbing capability upon impact of metallic bullets fired at about 400 m/s and 1000 m/s (such velocity allows to explore the low energy range of potential mechanical shocks in aerospace structures). The composite specimens under test are ∼3.5 mm thick tiles made of hybrid multi-scale material: the manufacturing has been performed by integrating several layers of Kevlar fabric and carbon fiber plies within a polymeric matrix reinforced by carbon nanotubes. The electromagnetic shielding effectiveness has been measured by means of a reverberation chamber; the performances of the layered composites approach the metallic behavior with values of shielding up to 80 dB. The impact tests have been carried out by using an in-house built linear electromagnetic accelerator, known as railgun; the results show that a thin and light tile of the designed composite material is able to absorb high energy impacts with local delamination of the layered structure.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/235951 Collegamento a IRIS

2016 Electrically Conductive DSP Cement Composites
JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
Autore/i: Mazzoli, Alida; Corinaldesi, valeria; Moglie, Franco; Mariani Primiani, Valter; Favoni, Orlando
Classificazione: 1 Contributo su Rivista
Abstract: Electromagnetic shielding and propagation in concrete structures are getting more and more interest in radiation hazard problems and wireless communications. The protection of sensitive environment is nowadays carried out by appropriate shielding room made of metallic walls. Even if effective they are heavy structures not adequate for the installation over existing building walls. The using of concrete composites filled by conductive elements represents a valid alternative to metallic shielded room since they can be adopted to directly build up the building walls and/or to easily plaster existing walls
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236228 Collegamento a IRIS

2016 Reliable Finite-Difference Time-Domain Simulations of Reverberation Chambers by Using Equivalent Volumetric Losses
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: Moglie, Franco; Bastianelli, Luca; Mariani Primiani, Valter
Classificazione: 1 Contributo su Rivista
Abstract: Email Print Request Permissions A numerical code based on the finite-difference time-domain technique is adopted to simulate a large reverberation chamber including the stirrers and the actual antenna presence in the frequency range 200-1000 MHz. The power of the code lies in the parallelization that allows the execution on high-performance computers. Chamber losses are accounted for by introducing virtual volumetric losses in the hypothesis of ideal conductor walls. The correction that arises from this choice which allows us to speed up the numerical computation is verified by a comparison with the case of wall losses implemented by assuming a finite conductivity. The analysis of the statistics of the chamber field, stirrer uncorrelated positions, Rician K-factor, backscatter, and field uniformity returns overlapping results for the two techniques. The analysis of the spatial field correlation within a spatial grid shows a correlation greater than 0.5 in the whole frequency range and for all stirrer angles, so confirming the equivalence of the two methods to manage losses.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/235950 Collegamento a IRIS

2016 Effect of loss distribution on uncorrelated spatial points and frequency steps in reverberation chambers
IEEE International Symposium on Electromagnetic Compatibility
Autore/i: Bastianelli, Luca; Primiani, Valter Mariani; Moglie, Franco
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The inclusion of losses in FDTD codes allows a reliable simulation of actual reverberation chambers. The using of equivalent volumetric losses makes simulations faster than the adoption of equivalent wall losses. In particular, in the case of wall losses the effect of considering a variable wall surface impedance is also analyzed. These different ways to manage RC losses in simulations are compared by analyzing their effects on uncorrelated spatial points and frequency steps. The uncorrelation degree is checked by a multivariate approach based on Pearson's correlation matrix. Results highlight that the volumetric and wall loss methods return similar values for the investigated quantities, so that the more simpler volumetric approach can be successfully applied.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/258995 Collegamento a IRIS

2016 FDTD simulations of the losses in complex electromagnetic cavities
Bulletin of the American Physical Society
Autore/i: Moglie, F.; Bastianelli, L.; Mariani Primiani, V.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The simulations of complex electromagnetic cavities like reverberation chambers (RC) require a massive parallel computer to accurately account the complex three dimensional geometry. A parallel finite-difference time-domain (FDTD) code optimized for a massive parallel computer could lose its efficiency if the losses are concentrated in some part of the computation volume. For example, the simulation of the finite conductivity of the cavity metallic walls requires a significant overcharge for the computer processors that handle the boundary part of the global computational domain. Our in-house parallel FDTD code replaces the volumetric losses in every cell of the grid instead of the Ohmic losses on the walls. In this contribution, we evaluate the difference in the field distribution inside the cavity due to this replacement. Moreover, we compare the common RC statistics like the number of stirrer uncorrelated positions and the field uniformity, and the resources required for the two methods are reported and discussed. Finally, the numerical results will be compared with the measurements of the RC in our laboratory with a volume of 60 m^3 and plated steel walls in the frequency range 0.2-1.0 GHz, that includes the transition from the undermoded to the overmoded region.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251366 Collegamento a IRIS

2016 Evaluation of stirrer efficiency varying the volume of the reverberation chamber
2016 IEEE International Symposium on Electromagnetic Compatibility (EMC 2016) Proceedings
Autore/i: Bastianelli, Luca; Moglie, Franco; Mariani Primiani, Valter
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A full-wave finite-difference time-domain code is adopted to simulate a large reverberation chamber including stirrers, actual antennas, and losses. Maintaining the stirrer geometry unaltered, the chamber performance is analyzed by varying its volume. In particular, stirrer uncorrelated positions and field uniformity are analyzed for one and two stirrers. In the case of a chamber with only one stirrer, the number of uncorrelated positions depends on the chamber volume. It increases by reducing the volume. On the contrary, the field uniformity continues to gain benefits from a chamber enlargement. A chamber with two stirrers operating in a interleaved mode has already a very good performance which shows a weakly dependence on the volume variation.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236363 Collegamento a IRIS

2015 Analytical prediction of common mode noise in a source stirred reverberation chamber
Proceedings of 2015 IEEE International Symposium on Electromagnetic Compatibility (EMC ),
Autore/i: De Leo, A.; Mariani Primiani, V.; Russo, P.; Cerri, G.
Editore: IEEE Conference Publications
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A multiple antenna source stirring technique is analytically studied and adopted to compute the common mode voltage induced across a cable terminal impedance. Sixty-two monopoles are distributed on the chamber walls. Chamber realizations are enhanced by feeding two antennas at a time so achieving a total of 1891 combinations. A cable loaded by a common mode impedance is inserted as device under test (DUT) inside the chamber. Both high frequency and low frequency cases are considered comparing the maximum values of the induced common mode voltage. In the model, all mutual coupling among the transmitting antennas and the DUT are accounted for. In the lower frequency range, undermoded condition, the technique takes benefit from the adoption of an out-of-phase feeding of each active couple of antennas. The electric field direction can be forced by a proper choice of the two active antennas.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227879 Collegamento a IRIS

2015 Electromagnetic Technologies as Travel Aids for Visually Impaired Subjects
Ambient Assisted Living Italian Forum 2014
Autore/i: Cerri, G.; De Leo, A.; Di Mattia, V.; Manfredi, G.; Mariani Primiani, V.; Petrini, V.; Pieralisi, M.; Russo, P.; Scalise, L.
Editore: Springer International Publishing
Classificazione: 2 Contributo in Volume
Abstract: The aim of this paper is to present the electromagnetic (EM) technology as possible assistive technology for the mobility tasks of visually impaired subjects. The paper will present their characteristics, discussing pros and cons of their use with respect to the existing traditional technologies and electronic travel aids, in terms of performances, miniaturization and wearing comfort. In particular, two applications of EM technologies will be presented more in detail: a first example consists in the design and realization of a laboratory prototype of an EM system able to detect the presence of obstacles along the walking path of visually impaired users and hence to assist them during their mobility tasks, possibly allowing them to walk safely and independently. The second example is the theoretical and experimental study of feasibility of an EM system specifically addressed to visually impaired runners. In conclusion, some hints for discussion will be presented; the user interaction with the sensing system, the signal analysis and possible features extraction will be reviewed addressing issues requiring a multidisciplinary approach.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227772 Collegamento a IRIS

2015 Power Boosting and Compensation During OTA Testing of a Real 4G LTE Base Station in Reverberation Chamber
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: Micheli, Davide; Barazzetta, Massimo; Moglie, Franco; Mariani Primiani, Valter
Classificazione: 1 Contributo su Rivista
Abstract: A fully operational 4G long-term evolution (LTE) base station is tested in a reverberation chamber to analyze its performance in the presence of a multipath environment, typical of wireless and vehicular communications. Transmission quality parameters are measured ranging from the empty chamber situation (very rich multipath channel) to a very high loading condition to mitigate multipath. In that way, both outdoor and indoor propagation are accounted for a large attenuation is inserted between the transmitter and the antenna to reduce the signal received by the user to real-life values encountered in both outdoor and indoor environments. In these scenarios, operators may choose to transmit a constant power spectral density throughout all LTE spectrum, or to increase the energy of control channels at the expense of data channels in order to enforce transmission and provide better quality to the user, especially in poor radio conditions. This is called “power boosting,” and its effect is analyzed in this paper.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227716 Collegamento a IRIS

2015 Stirrer Efficiency as a Function of its Axis Orientation
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: Bastianelli, Luca; Mariani Primiani, Valter; Moglie, Franco
Classificazione: 1 Contributo su Rivista
Abstract: The performance of a mechanical stirrer is numerically investigated, when its rotation axis is moved parallel to the three Cartesian axes in the reverberation chamber. We present results for the same stirrer, and for a stirrer with the same paddles but a different length to match the chamber sides. The number of uncorrelated stirrer positions is calculated using our finite-difference time-domain code, optimized for reverberation chamber simulations in high-performance computers. No significant differences were found in the simulation results when the stirrer axis and length are changed. However, a significant stirrer performance enhancement occurs when the blade width is increased.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/229295 Collegamento a IRIS

2015 Domestic monitoring of respiration and movement by an electromagnetic sensor
Ambient Assisted Living
Autore/i: V. Petrini; V. Di Mattia; A. De Leo; P. Russo; V. Mariani Primiani; G. Manfredi; G. Cerri; L. Scalise;
Editore: Springer International Publishing
Classificazione: 2 Contributo in Volume
Abstract: The aim of this paper is to investigate the capabilities of a novel electromagnetic technique designed for contactless monitoring of breathing activity in Ambient Assisted Living applications. The method is based on the transmission of a frequency sweep and the measurement of the reflection coefficient to determine the respiration rate of a subject. To date, the method is under optimization, but it has already shown interesting capabilities of calculating not only the respiration rate, but also additional features, as the position of the subject inside a room and his/her movements. After a brief mathematical description of the algorithm, some preliminary tests will be described concerning the monitoring of a human target inside a room. These first results clearly show the capability of the method to detect the subject, his breathing rate, position and physical activity. Of course further signal processing is required in order to distinguish between different types of movements and to classify them.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205324 Collegamento a IRIS

2015 An EM Modeling for Rescue System Design of Buried People
INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
Autore/i: DE LEO, Alfredo; Petrini, Valerio; Russo, Paola; Scalise, Lorenzo; DI MATTIA, Valentina; MARIANI PRIMIANI, Valter; Cerri, Graziano
Classificazione: 1 Contributo su Rivista
Abstract: The development of a rescue system for buried persons is a subject of growing importance in case of occurrence of natural disasters such as earthquake, landslides, or avalanches. In this paper a fully analytical model has been developed to get some fundamental a priori design characteristics. The proposed system is based on the detection of the victim movements due to its respiratory activity: in particular, when an electromagnetic (EM) wave impinges on a human body, the analysis of the reflected wave parameters such as amplitude, frequency, phase, or delay time allows for the detection of the breathing frequency. The model is simple on purpose because the great uncertainty concerning the characterization of many environmental parameters of a general situation makes a very detailed model useless. However, it is accurate enough to provide useful information about system design, filling the gap in the literature concerning the electromagnetic formulation of such kinds of problems. A system prototype was built using laboratory equipment to experimentally validate the model, and subsequently breathing frequency measurements were carried on, both in a lossless laboratory environment and in a lossy realistic scenario.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/226935 Collegamento a IRIS

2015 Effect of the stirrer orientation and positioning on the reverberation chamber statistics
Cineca HPC Report 2015
Autore/i: Bastianelli, Luca; Mariani Primiani, Valter; Moglie, Franco; Gradoni, Gabriele
Editore: Cineca Consorzio Interuniversitario
Luogo di pubblicazione: Casalecchio di Reno (BO)
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/249540 Collegamento a IRIS

2015 Massive simulation of complex electromagnetic cavities
Bulletin of the American Physical Society
Autore/i: Moglie, F.; Bastianelli, L.; Mariani Primiani, V.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The analysis of the chaotic behavior of complex electromagnetic cavities takes benefit from the availability of a large amount of data on field samples. The application of a code running on a supercomputer is able to return a precise electromagnetic simulation of electrically large structures. The simulations of mode-stirred reverberation chamber (RC) were performed using an in-house parallel finite-difference time-domain (FDTD) code. The code is divided into three modules that are managed by a unique, single-step job: the electromagnetic solver based on the FDTD method; a fast Fourier transform (FFT) to obtain the frequency domain behavior; a statistical tool to obtain the RC properties. A unique run produces statistical results for all the investigated stirrer angles, without the burden of saving intermediate data. The code implements a hybrid parallelization as function of stirrer angle and cavity volume. Specifically, such a computation is known to be “embarrassingly parallel” with respect to the stirrer angle. The excitation is a Gaussian pulse modulated sinusoid at 1.1 GHz: the 95% bandwidth is 0.2 and 2 GHz. After the FDTD simulation is completed, the FFT module gives the frequency behavior of the fields in each point with a resolution of about 50 kHz.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251365 Collegamento a IRIS

2015 A mechanical mode-stirred reverberation chamber inspired by chaotic cavities
2015 IEEE Metrology for Aerospace (MetroAeroSpace)
Autore/i: Moglie, Franco; Gradoni, Gabriele; Bastianelli, Luca; Mariani Primiani, Valter
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A multivariate approach to the calculation of field-field correlation matrices is used to estimate the number of uncorrelated positions in a mode-stirred reverberation chamber (RC) inspired by chaotic cavities. The growth of the number of independent stirrer configurations is found to increase more rapidly with frequency than in a conventional RC. This is ascribed to the regular geometry forming the baseline cavity (screened room) of an RC, responsible for localizing energy and preserving regular (bouncing ball) modes. Smooth wall deformations are introduced in order to create underlying wave dynamical instability and then destroy survived regular modes. Numerical full-wave simulations are performed for a reverberation chamber with corner hemispheres and wall spherical caps. Field sampling is performed by moving a mechanical “carousel” stirrer. It is found that a wave-chaotic RC has improved performances in terms of lowest usable frequencies and number of uncorrelated cavity realizations of mechanical stirrers.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227745 Collegamento a IRIS

2015 Shielding effectiveness of carbon nanotube reinforced concrete composites by reverberation chamber measurements
Proceedings of the 2015 International Conference on Electromagnetics in Advanced Applications, ICEAA 2015
Autore/i: Micheli, D.; Marchetti, M.; Pastore, R.; Vricella, A.; Gradoni, G.; Moglie, F.; Mariani Primiani, V.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The shielding effectiveness of carbon nanotube reinforced concrete composite is analyzed by using a reverberation chamber. The frequency band is 0.8-8 GHz and the weight percentages of carbon nanotube are 0, 1, 3 wt%. Results highlight that about 30 mm thick of 3 wt% reinforced concrete composite is able to perform a shielding effectiveness greater than 15 dB around 2 GHz and up to 30 dB at 8 GHz. The here reported results suggest the employment of carbon nano-powder reinforced concrete in building structures, having issues related to the electromagnetic interference mitigation, such as the influence on the medical devices working in hospital environments as well as the increasing of protection against electromagnetic attacks to strategic targets and sensible places.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/235037 Collegamento a IRIS

2015 Coupling Between Multipath Environments Through a Large Aperture
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Autore/i: Gagliardi, Luigi; Micheli, Davide; Gradoni, Gabriele; Moglie, Franco; Mariani Primiani, Valter
Classificazione: 1 Contributo su Rivista
Abstract: A key issue in measuring the shielding of buildings against wireless communications signals is presented. We use a mode-stirred reverberation chamber (RC) to emulate the EM coupling through windows or doors. This is achieved experimentally by leaving the RC door open. The room hosting the RC is identified as an external semi-reverberant space, and thus used to generate the stochastic field exciting the internal RC through the door opening. Two methods for the transmission parameter measurement and shielding effectiveness estimation are compared: the first one consists in moving receiving antenna within a volume, the second one makes use of a rotating stirrer. The comparison confirms the interchangeability of the two techniques provided a proper averaging factor is introduced. This argument supports a quasi-ergodic hypothesis in imperfect and semi-open reverberating environments. The measured aperture SE is compared to a theoretical value given by an ideal reverberating environment.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227452 Collegamento a IRIS

2015 Effect of absorber number and positioning on the power delay profile of a reverberation chamber
2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)
Autore/i: Bastianelli, Luca; Giacometti, Luca; Mariani Primiani, Valter; Moglie, Franco
Editore: iEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The paper shows how a reliable numerical code allows to optimize the number and the position of absorbers inside a reverberation chamber (RC) to properly reduce the chamber decay time. Simulation carried out on different situations demonstrate that the chessboard strategy is the best choice. Results are compared to measurements showing a good agreement. The RC power delay profile can be tuned close to that of real life environments.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227866 Collegamento a IRIS

2015 Uncorrelated frequency steps in a reverberation chamber: A multivariate approach
2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)
Autore/i: Gradoni, Gabriele; Bastianelli, Luca; Mariani Primiani, Valter; Moglie, Franco
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The use of correlation matrices to estimate the number of uncorrelated frequency steps of the reverberation chamber field is presented and discussed. Finite-difference time-domain simulations of an actual reverberation facility are performed through an in-house parallel code. The efficiency of this code allows for capturing the field behavior through large spatial volumes. Spatial field samples are used to construct the multivariate correlation function and to evaluate the number of uncorrelated frequencies over a broad band. Results are obtained for single rectangular component and total field. It is found that traditional (autocorrelation based) methods tend to overestimate the number of uncorrelated frequency steps, with respect to the proposed (multivariate) approach.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227867 Collegamento a IRIS

2015 Analysis of field probe perturbation in a mode stirred reverberation chamber
2015 IEEE International Symposium on Electromagnetic Compatibility & Signal Integrity
Autore/i: Bastianelli, Luca; Mariani Primiani, Valter; Moglie, Franco
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The residual stirring action of two commercially available electric field probes is experimentally and numerically analyzed. The capability to stir the reverberation chamber field is not negligible, and it alters the independent positions of mechanical rotating paddles when the spatial correlation matrix method is applied to evaluate them. The numerical code adopted for the simulations reveals its reliability and it can be employed to check probes during the design stage. Finally, we numerically evaluated the stirring effect of a conductor tripod that increases the independent positions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/226106 Collegamento a IRIS

2015 Advanced concrete materials for EMI reduction in protected environment and IEMI threats suppression
2015 IEEE 15th International Conference on Environment and Electrical Engineering (EEEIC)
Autore/i: Pastore, Roberto; Micheli, Davide; Vricella, Antonio; Morles, Ramon Bueno; Marchetti, Mario; Moglie, Franco; Mariani Primiani, Valter
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The enhancement of microwave shielding effectiveness of commercial concrete by the inclusion of carbon nanotubes powder is addressed and experimental testified. A microwave characterization is performed by direct measurements of materials dielectric parameters in the frequency range 1.7-2.6 GHz. A significant lowering of the microwave transmission magnitude is founded for the nanoreinforced material respect to the naked concrete. The results allow to evaluate the microwave shielding capability of wallshaped concrete structures: a shielding effectiveness grater than 50 dB is achieved for a 30 cm thick wall with carbon nanotube filling percentage of 3wt%. The route of nanoparticles filling within the composite mixture is straightforwardly included in the concrete typical on-site manufacturing procedures, thus planning out a time/cost saving procedure with the final aim to promote such typology of materials for commercial purpose in the next future. The here reported preliminary findings pave the way for the employment of carbon nano-powder reinforced concrete in building walls, in order to deal with issues related to the electromagnetic interference mitigation, such as the influence on the medical devices working in hospital environments as well as the increasing of protection against electromagnetic attacks to strategic targets and sensible places.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227769 Collegamento a IRIS

2014 An electromagnetic device for autonomous mobility of visually impaired people
Proceedings of the European Microwave Week 2014
Autore/i: V. Di Mattia; L. Scalise; P. Russo; A. De Leo; V. Mariani Primiani; V. Petrini ; G. Cerri
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The design of an electromagnetic (EM) novel device to be used as travel support to the mobility of visually impaired people is presented in this work. In particular, a preliminary study has been carried out using laboratory instrumentation in order to investigate the performances of an EM system in detecting obstacles located along user pathway, both in indoor and outdoor cluttered environments. Moreover, a portable EM system prototype has been realized and tested with a blind volunteer in order to both demonstrate potentialities and highlight peculiarities of using EM pulses for this application. The proposed EM system accomplishes most of the operative requirements of electronic travel aids for visually impaired subjects and can even provide additional information on obstacles, as for example height from the ground, distance and position.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/172704 Collegamento a IRIS

2014 EMC Aspects in Test Benches for Automotive Equipments
2014 International Symposium on Electromagnetic Compatibility, Tokyo (EMC'14/Tokyo),
Autore/i: Pieralisi M. ; Primiani Mariani V.; Russo P. ; De Leo A.; Cerri G. ; Fioravanti Matteo
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The continuous increase of demand for radios navigators makes the use of Automatic Test Equipments compulsory, in order to reduce the testing time and cost. The Telemakos is an Italian test equipment specifically designed to check radio navigator sensitivities. The paper reports the electromagnetic compatibility analysis carried out to meet the noise specifications. The Telemakos test bench is a very complex system, where subsystems fabricated by different manufacturers have to cooperate. The paper describes the actions required at power supply level, at cable harness level, and at fuse matrix level to ensure a complete internal electromagnetic compatibility.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205321 Collegamento a IRIS

2014 Design and realization of a wideband antenna for non-contact respiration monitoring in AAL application
MESA 2014 - 10th IEEE/ASME International Conference on Mechatronic and Embedded Systems and Applications, Conference Proceedings
Autore/i: V. Di Mattia; V. Petrini; E. Pallotta; A. De Leo; M. Pieralisi; G. Manfredi; P. Russo; V. Mariani Primiani; G. Cerri; L. Scalise;
Editore: IEEE / Institute of Electrical and Electronics Engineers
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This contribution is part of a wider research project whose final aim is the realization of a small EM sensing system for non-contact monitoring of respiration activity in indoor environments. The paper presents the design of an optimized radiating element that satisfies challenging requirements: good impedance matching over a wide frequency bandwidth (3-5 GHz), directive radiation pattern, small dimensions (in order to reduce its invasiveness) and low cost for realization. In detail, an antenna model already existing in literature has been optimized and adapted to this specific application using a full wave numerical simulator. Finally a first antenna prototype has been realized and experimentally tested to compare the measured parameters with the simulated results.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205718 Collegamento a IRIS

2014 Ambient Assisted Living electromagnetic sensor for continuous breathing monitoring applied to movement analysis: a preliminary study
Proceedings of the IEEE/ASME International Conference on Mechatronic and Embedded Systems and Applications
Autore/i: V. Petrini; V. Di Mattia; A. De Leo; P. Russo; V. Mariani Primiani; G. Manfredi; L. Scalise; G. Cerri
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The aim of this paper is to investigate the capabilities of a novel electromagnetic technique designed for contactless monitoring of breathing activity in Ambient Assisted Living applications. The method is based on the transmission of a frequency sweep and the measurement of the reflection coefficient to determine the respiration rate of a subject. To date, the method is under optimization, but it has already shown interesting capabilities for calculating not only the respiration rate, but also additional features, as the position of the subject inside a room and his/her movements. After a brief mathematical introduction of the algorithm, some preliminary tests are presented concerning the monitoring of a human target inside a room. These first results clearly show the capability of the method to detect the subject, his breathing rate, position and physical activity. Of course further signal processing is required in order to distinguish between different types of movements and to classify them.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/172703 Collegamento a IRIS

2014 A Novel Measurement Method for Respiration Rate by Electromagnetic Frequency Sweep
Proceedings of the IEEE International Symposium on Medical Measurements and Applications,
Autore/i: L. Scalise; V. Petrini; P. Russo; V. Mariani Primiani; A. De Leo; V. Di Mattia; G. Cerri
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The non-contact measurement of the respiration rate of a subject offers several interesting applications in hospital as well as in domestic environments. The use of electromagnetic waves has been proved to be a feasible approach to this purpose. In this paper, authors present a novel measurement method, based on the transmission of a frequency sweep and the measurement of the reflection coefficient (S11), to determine the respiration rate of the monitored subject without contact. The proposed method places itself at the half-way between continuous wave (CW) and ultra wide band (UWB) techniques, offering some advantages of both methods and improving its feasibility. Experimental tests have been carried out on voluntary subjects simultaneously measured with two reference systems in order to compare respiration frequency values. Results show a good correlation between the data measured during tests, proving that the proposed method is a valid approach to the issue of the non-contact assessment of the respiration rate both in clinical and domestic environments.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/172702 Collegamento a IRIS

2014 Theoretical and Experimental Safety Aspects Evaluation of Induction Heating Cooking Systems
IEEE International Symposium on Electromagnetic Compatibility
Autore/i: De Leo A.; Russo P.; Cerri G.; Mariani Primiani V.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this paper a rigorous approach for the computation of the electromagnetic field around an actual Induction Heating (IH) cooking system is presented. The electromagnetic model is validated by the comparison with the measurements of the input impedance of the coils and the magnetic flux density spatial distribution. The predictions of the model are used to calculate the safety area according to ICNIRP requirements.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/187904 Collegamento a IRIS

2014 The Electromagnetic Technology for Safe Mobility of Visually Impaired People
Proceedings of the 22nd Mediterranean Conference on Control and Automation
Autore/i: G. Cerri; A. De Leo; V. Di Mattia; G. Manfredi; V. Mariani Primiani; V. Petrini; M. Pieralisi; P. Russo; L. Scalise
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/172705 Collegamento a IRIS

2014 A Breathing Detection Medical Device for Rescue of Buried People
IEEE International Symposium on Electromagnetic Compatibility
Autore/i: De Leo A.; Petrini V.; Russo P.; Mariani Primiani V.; Scalise L.; Cerri G.
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this work the feasibility study of a medical equipment based on electromagnetic technology for breathing detection is presented; this system was designed to detect a victim buried from a landslide through the sensing of the thorax displacements due to breathing activity. The system was preliminary tested into a controlled environment and subsequently in a real scenario (a road construction site) where its use could minimize the time between the accident and the arrival of the first emergency team, so increasing the chance to save the victim's life.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/191304 Collegamento a IRIS

2014 Electromagnetic sensing of obstacles for Visually Impaired users
Ambient Assisted Living
Autore/i: Scalise, Lorenzo; DI MATTIA, Valentina; Russo, Paola; DE LEO, Alfredo; MARIANI PRIMIANI, Valter; Cerri, Graziano
Editore: Springer International Publishing Switzerland
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Respiration activity is one of the fundamental functions of the human being (also known as vital signs) which is monitored for health purposes. Often it is required to operate the sensing of the respiration activity out of hospitals or clinical environments and without contact with the patient and possibly from a distance i.e. for the home monitoring of patients or for the ambient assisted living, AAL). Unfortunately, at present the sensing apparatus for respiration monitoring purposes are mainly based on the use of contact methods (chest belt, nasal temperature transducers, etc.) which appear to be not suited for such tasks. In this paper, the authors propose a novel approach based on the use of electromagnetic sensing of the respiration activity of subject. The proposed approach provide a remote, continuous measurement of the inspiration/expiration acts of a subject without requiring a contact; these features of the proposed system are suited for domestic monitoring and AAL.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/172706 Collegamento a IRIS

2014 Remote Measurement of the Respiration by Electromagnetic Sensing
Ambient Assisted Living
Autore/i: Scalise, Lorenzo; Petrini, Valerio; Russo, Paola; DE LEO, Alfredo; MARIANI PRIMIANI, Valter; DI MATTIA, Valentina; Cerri, Graziano
Editore: Springer International Publishing Switzerland
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/172707 Collegamento a IRIS

2014 Efficient numerical–analytical tool for time domain obstacles detection
IET SCIENCE, MEASUREMENT & TECHNOLOGY
Autore/i: V. Di Mattia; P. Russo; A. De Leo; L. Scalise; V.M. Primiani; G. Cerri
Classificazione: 1 Contributo su Rivista
Abstract: The aim of this work is to implement a mixed approach able to provide an efficient time domain solution of the electromagnetic (EM) coupling between an antenna and an obstacle distant few meters away. The idea is to divide the problem into a small number of less complex sub-problems exploiting the advantage of solving some of them by analytical models and the others by numerical codes. To this end, the electric field radiated by the antenna just close to the object has been sampled in time and spatial domains by means of a small number of plane waves; for each plane wave impinging on the object, the scattering problem has been solved by a commercial code; finally, the total echo has been obtained as analytical summation of all the scattering contributions at the antenna position. The resulting echo has been compared with that coming from a full-wave numerical solution, whereas the voltage signal received at the antenna port has been compared with that measured by experimental investigations. The positive results obtained demonstrate the possibility of using the tool to effectively study obstacle detection problems, for example as support to the design of an EM obstacles detector to improve visually impaired mobility.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/128278 Collegamento a IRIS

2014 Safety Investigation of a Magnetic Pulse Applicator for Heart Stimulation
IEEE TRANSACTIONS ON MAGNETICS
Autore/i: Alfredo De Leo; Valter Mariani Primiani; Paola Russo; Franco Moglie; Graziano Cerri
Classificazione: 1 Contributo su Rivista
Abstract: The safety area around the applicator of a high current pulse generator, able to magnetically stimulate the human heart, is characterized in terms of allowable induced current. The magnetic field produced by the adopted coil is computed using a complete analytical model to determine the limit area allowed for medical operators. The International Commission on Non-Ionizing Radiation Protection recommendation is adopted for the occupational exposure limits. The presence of a ferrite tile close to the stimulation coil is also investigated. The ferrite tile enhances the field level on the patient side, making the magnetic stimulation more efficient. Experimental validation demonstrates the model's reliability.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/177302 Collegamento a IRIS

2014 SOURCE STIRRING ANALYSIS FOR REVERBERATION CHAMBERS
PROCEEDINGS OF THE XX RINEM
Autore/i: Cerri, Graziano; DE LEO, Alfredo; MARIANI PRIMIANI, Valter; Russo, Paola
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The source stirring technique for reverberation chambers (RC) is obtained by several monopole antennas located on the chamber walls. The stirring action is accomplished subsequently feeding each antenna pairs covering all possible combinations. Antennas are fed by real generators and their length is not negligible with respect to the wavelength. An efficient way, that improves the modal series convergence, is presented to compute the electromagnetic field inside the large shielded room. Results are checked by means of typical RC parameters such as the cumulative distribution function (CDF), the polar plot of each field components and field uniformity. Out-of-phase dipole feeding allows to improve field uniformity especially in the lower frequency range.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266647 Collegamento a IRIS

2014 Effect of losses on the maximum-to-mean value in a mode-stirred reverberation chamber
2014 International Symposium on Electromagnetic Compatibility
Autore/i: Gabriele Gradoni; Valter Mariani Primiani; Franco Moglie
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Performances of reverberation chambers exhibit a non-trivial dependence on distributed losses. It is shown through numerical simulations that the average maximum-to-mean chamber field/power do not decrease with increasing losses as expected. Rather, it reaches an optimal value at moderate losses. Interestingly, the chamber field uniformity is also optimized at the same amount of losses. This behavior is accompanied by a progressive reduction of the quality factor and of the number of independent stirrer positions, indicating that losses augment the unstirred components as partial field coherence develops. A statistical model, the random coupling model, based on wave-chaos is used to shed light on the role of modal fluctuations and losses in the achievement of an optimal stress. It is found that the optimal condition is reached when losses extend the cavity bandwidth up to the average mode-to-mode spacing. Then, further increasing losses results in a suboptimal condition, for which the open-cavity behavior takes over, i.e., the ratio decreases.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/195305 Collegamento a IRIS

2014 Measurement and Simulation of Stirring Effects of Field Probes in a Reverberation Chamber
Atti della XX Riunione Nazionale di Elettromagnetismo
Autore/i: Luca Bastianelli; Valter Mariani Primiani; Franco Moglie
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The residual stirring action of two commercially available electric field probes is experimentally and numerically analyzed. The capability to stir the reverberation chamber field is not negligible, and it alters the independent positions of mechanical rotating paddles when the spatial correlation matrix method is applied to evaluate them. The numerical code adopted for the simulations reveals its reliability and it can be employed to check probes during the design stage.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/195302 Collegamento a IRIS

2014 Massive simulation and complete statistical analysis of reverberation chambers
Cineca HPC Report 2014
Autore/i: Luca Bastianelli; Luca Giacometti; Valter Mariani Primiani; Franco Moglie; Gabriele Gradoni
Editore: Cineca Consorzio Interuniversitario
Luogo di pubblicazione: Bologna
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/212720 Collegamento a IRIS

2014 Numerical Simulations of Field Values, Wave Impedance, and Received Power Inside a Nonideal Reverberation Chamber
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: Franco Moglie; Valter Mariani Primiani
Classificazione: 1 Contributo su Rivista
Abstract: The behavior of the ensemble averaged wave impedance computed by the rectangular field components and the impedance computed by the total field is numerically studied for a nonideal reverberation chamber. Evident departures from the medium intrinsic impedance are observed for the rectangular components when the ratio of the means and the mean of the ratios are exchanged. The power received by the antenna placed in the chamber is compared to that computed by the total field components, the rectangular field components using the wave impedance and the intrinsic impedance.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/144282 Collegamento a IRIS

2014 Broadband electromagnetic characterization of carbon foam to metal contact
CARBON
Autore/i: D. Micheli; R.B. Morles; M. Marchetti; F. Moglie; V. Mariani Primiani
Classificazione: 1 Contributo su Rivista
Abstract: We investigated how the electrical contact of carbon foam with metallic surface can reduce its shielding properties. The bubble structure of the foam does not ensure a good electrical contact with the metal, and it leads to a significant reduction of the shielding effectiveness. A finite element numerical simulation was carried out by adopting a bubble/pore model of the internal microstructure of the foam, recovered by means of scanning electron microscope images. Experimental tests were carried out by inserting carbon foam samples into a coaxial transmission line. Numerical results agree well with experimental result showing significant performance reduction with respect to an ideal electrical contact.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/139462 Collegamento a IRIS

2014 Reverberation Chamber Performance Varying the Position of the Stirrer Rotation Axis
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: Mariani Primiani V.; Moglie F.
Classificazione: 1 Contributo su Rivista
Abstract: We analyzed how the position of the stirrer influences the reverberation chamber (RC) performance. We simulated a RC moving the rotation axis of the stirrer from a corner to the center. Simulation is carried out by a finite-difference time-domain code optimized for high-performance computers. Results show that the stirrer rotation center position weakly affects the most used statistical parameters.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/120862 Collegamento a IRIS

2014 A continued evaluation of the general method for determining the number of independent stirrer positions in reverberation chambers2014 International Symposium on Electromagnetic Compatibility
2014 International Symposium on Electromagnetic Compatibility
Autore/i: Stephan Pfennig; Hans Georg Krauthauser; Franco Moglie; Valter Mariani Primiani
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A method for estimating the number of independent stirrer positions in reverberation chambers is described in IEC 61000-4-21. This standard method is known to have disadvantages, but is a practical way to estimate the number of independent stirrer positions with comparatively low effort. A general method for determining the number of independent stirrer positions in reverberation chambers was presented in the previous papers. For this method the field distributions are measured for a given number of points within a defined test volume and as a function of stirrer positions. The field distributions of the used stirrer positions are tested for linear correlation using the Pearson correlation coefficient and a certain correlation threshold. In the following paper the evaluation of the general method is continued. Especially the dependency from the number of measurement points and the correlation threshold is investigated. The results are compared to the simulation results obtained by a numerical analysis of the given chamber.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/195303 Collegamento a IRIS

2014 Electromagnetic characterization and shielding effectiveness of concrete composite reinforced with carbon nanotubes in the mobile phones frequency band
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
Autore/i: D. Micheli; R. Pastore; A. Vricella; R.B. Morles; M. Marchetti; A. Delfini; F. Moglie; V. Mariani Primiani
Classificazione: 1 Contributo su Rivista
Abstract: The electromagnetic properties of carbon nanotube powder reinforced concretes are numerically and experimentally characterized. This typology of composite material is built by following the simple procedure usually adopted for the on-site concrete production. The dielectric parameters are investigated by means of waveguide measurements in the frequency band 0.75–1.12 GHz that is currently exploited in mobile phone radio access networks. The obtained results are used to compute the electromagnetic shielding effectiveness of large wall-shaped concrete structures. A shielding effectiveness up to 50 dB is obtained for a 15 cm thick wall when the carbon nanotube inclusion is raised up to 3 wt%.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/179131 Collegamento a IRIS

2014 4G-LTE base station output power estimation from statistical counters during over-the-air tests in reverberation chamber2014 International Symposium on Electromagnetic Compatibility
2014 International Symposium on Electromagnetic Compatibility
Autore/i: Massimo Barazzetta; Davide Micheli; Paolo Gianola; Franco Moglie; Valter Mariani Primiani
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The downlink transmission power of a 4G-LTE base station is quantified by means of statistical counters. They are build up analyzing the physical resource blocks allocated during transmission at different data throughputs. The analysis is performed during complete over the air tests carried out inside a reverberation chamber. The reverberation chamber allows to vary dynamic fading conditions by changing the stirrer rotating speed and the quality factor. Results are compared to direct antenna input power measurements obtained by a spectrum analyzer, in order to identify the better way to combine statistical counters. The analysis confirms the possibility to use this counters to monitor continuously the transmitted power over long time periods
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/195304 Collegamento a IRIS

2014 Over-the-air performance testing of a real 4G LTE base station in a reverberation chamber
2014 IEEE International Symposium on Electromagnetic Compatibility (EMC)
Autore/i: Massimo Barazzetta; Davide Micheli; Franco Moglie; Valter Mariani Primiani
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Fourth generation (4G) cellular systems have been nowadays rolled out already in several countries in the world. With networks open to commercial use, one of the key issues is how the quality perceived by the user is influenced by multipath propagation, like it may happen in indoor locations or in any kind of places where electromagnetic waves are partially reflected by walls and other objects. In order to verify this, the signal of a real 4G base station connected to the real radio access network of Telecom Italia has been transmitted into a reverberation chamber where a client was running FTPs using a 4G capable USB dongle as a modem. This paper describe the tests that have been performed and focus on how changes in propagation conditions affected the performances perceived by the user.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/197507 Collegamento a IRIS

2014 Dependence of reverberation chamber performance on distributed losses: A numerical study
2014 IEEE International Symposium on Electromagnetic Compatibility (EMC)
Autore/i: Gabriele Gradoni; Valter Mariani Primiani; Franco Moglie
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Finite-difference time-domain simulations of reverberation chambers exhibit a strong frequency dependence of field/power fluctuations on distributed losses. The performances of a reverberation chamber are calculated at different loss conditions and in a wide frequency band in terms of backscatter coefficient, and number of independent positions. Those performance indicators are related to field and power statistics through the scattering coefficients. A goodness-of-fit test is applied to analyze the statistical distribution functions of the numerical transmission scattering coefficient. Strong deviations from idealized distribution functions, some unexpected, are observed varying the chamber loading at both low- and high-frequencies. Observed phenomena are confirmed from the random coupling model, which reconciliates findings with the universal behavior of wave chaotic systems, as well as with previous studies of other investigators.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/197508 Collegamento a IRIS

2014 Railgun test of nano-reinforced layered composite materials for ballistic impact and electromagentic shielding
54th Israel Annual Conference on Aerospace Sciences 2014
Autore/i: Davide Micheli; Antonio Vricella; Roberto Pastore; Marta Albano; Mario Marchetti; Gabriele Gradoni; Franco Moglie; Valter Mariani Primiani
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: A layered composite material have been manufactured and characterized in terms of electromagnetic shielding effectiveness and of energy absorbing capability upon impact of metallic bullets fired at about 400 m/s. This impact velocity is in the range of potential mechanical shock in aeronautical field. The composite material under test has a thickness of about 2mm. It has been manufactured by integrating several layers of Kevlar fabric and carbon fiber ply within a polymeric matrix reinforced by carbon nanotubes. The electromagnetic shielding effectiveness has been measured by using a reverberation chamber. Measurements approach the metallic behavior with values of shielding up to 80 dB. Impact test on material has been performed by using a linear electromagnetic accelerator typically known as railgun. Results show that a thin and light tile of nanoreinforced composite material is able to absorb one shot with a local delamination of the layered structure. Overall goal was to develop a material which is simultaneously able to absorb mechanical shock waves and protect electronic equipment from electromagnetic interference.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/181319 Collegamento a IRIS

2013 Electromagnetic travel aids for visually impaired users
Proceedings of the 2013 International Conference on Electromagnetics in Advanced Applications, ICEAA 2013
Autore/i: Valentina Di Mattia; Paola Russo; Lorenzo Scalise; Alfredo De Leo; Valter Mariani Primiani; Valerio Petrini; Graziano Cerri
Editore: IEEE / Institute of Electrical and Electronics Engineers
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This paper describes the development of an electromagnetic travel aid aiming to the improvement of the mobility of blind and visually impaired subjects in unknown environments. The paper reports the preliminary results obtained with a portable prototype. They show the feasibility of the electromagnetic “cane”, the possibility to detect the presence of obstacles not detected with ordinary cane and address further improvements
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/128281 Collegamento a IRIS

2013 Dispositivo elettromagnetico per la guida di un soggetto ipovedente o non vedente.
Autore/i: L. Scalise; V. Mariani Primiani; P. Russo; A. De Leo; G. Cerri
Classificazione: 6 Brevetti
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/98262 Collegamento a IRIS

2013 EM System to Guide Visually Impaired Running Athlete
Piers 2013
Autore/i: V. Petrini; V. Di Mattia; M. Pieralisi; L. Scalise; V. Mariani Primiani; A. De Leo; P. Russo; G. Cerri
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/158720 Collegamento a IRIS

2013 An efficient model for the field analysis in source stirred reverberation chambers
Proceedings of the 2013 International Symposium on Electromagnetic Compatibility, EMC Europe 2013
Autore/i: P. Russo; V. Mariani Primiani; G. Cerri
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The source stirring technique for reverberation chambers (RC) is obtained by several monopole antennas located on the chamber walls. The stirring action is accomplished subsequently feeding each antenna pairs covering all possible combinations. Antennas are fed by real generators and their length is not negligible with respect to the wavelength. An efficient way, that improves the modal series convergence, is presented to compute the electromagnetic field inside the large shielded room. Results are checked by means of typical RC parameters such as the cumulative distribution function (CDF), the polar plot of each field components and field uniformity.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/156302 Collegamento a IRIS

2013 A Hybrid Numerical-Analytical Model for the Electromagnetic Characterization of the Admittance Matrix of Scattering Objects
PROGRESS IN ELECTROMAGNETICS RESEARCH B
Autore/i: Russo, Paola; D., Shahu; DE LEO, Alfredo; MARIANI PRIMIANI, Valter; Scalise, Lorenzo; Cerri, Graziano
Classificazione: 1 Contributo su Rivista
Abstract: The aim of this work is to implement a hybrid approach able to provide an efficient solution of the electromagnetic coupling between an antenna and an obstacle distant few meters away. The idea is to divide the problem into a small number of less complex sub-problems exploiting the advantage of generating the admittance matrix that describes the scattering problem by a numerical code. To this end, the electromagnetic field impinging on the object has been characterized by means of a proper number of very narrow beams; for each beam the scattering problem has been solved by a commercial code; finally, the total admittance matrix has been obtained as composition of all the scattering contributions. The resulting echoof a moving obstacle has been compared with that measured by experimental investigations, both for metallic and dielectric bodies.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/129662 Collegamento a IRIS

2013 Developing and Testing a Capacitive Distance Sensor for Use in Industrial Environment
Proc. of the 2013 International Symposium on Electromagnetic Compatibility (EMC Europe 2013)
Autore/i: A. De Leo; D. Scaradozzi; G. Conte; M.Candelaresi; G. Cerri; V. Mariani Primiani; P. Russo
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this work, the development and the testing of a capacitive distance sensor, based on E-field measurement, for applications in industrial environments is presented. In particular, the structure and the working principle of the sensor, as well as the process of optimization of the sensing elements and some functional tests in absence of disturbances are described. Then, the EMC precompliance, in particular the radiated susceptibility and the ESD immunity, is experimentally investigated. In particular it must assured that the functionality of the robot will be compliant to safety assessment even in the presence on an external disturb. Results are discussed and solutions to make the apparatus more immune are briefly outlined.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/129862 Collegamento a IRIS

2013 Wireless sensing for the respiratory activity of human beings: measurements and wide band numerical analysis.
INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
Autore/i: Lorenzo Scalise; Valter Mariani Primiani; Paola Russo; Alfredo De Leo; Desar Shahu; Graziano Cerri
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, an electromagnetic sensing system for the measurement of the respiratory activity is presented. The aims are to demonstrate the feasibility of the proposed approach and in particular to evaluate the effect on the measured signal of the distance between the subject and the sensing apparatus. Moreover an electromagnetic model of the system, including the monitored subject, is proposed as a tool to solve the problem of selecting working parameters for system design. The sensing system is based on the measurement of the phase variation of the reflection coefficient caused by the respiratory activity. The phase signal compared with the thorax displacement measured by a reference instrument shows a high correlation (R =0.97) for different subject postures (sitting, standing and lying) and a reduction of the signal amplitude with the distance (-0.11 dB/cm) is reported. The numerical simulations performed on a wide band highlight the frequencies where the method exhibits the highest sensitivity to thorax movements. The sensitivity can be further improved by reducing the antenna beamwidth. Despite the signal amplitude reduction, the proposed system makes it possible to correctly operate at distances up to 2.5 m.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/94263 Collegamento a IRIS

2013 Performance and Immunity Evaluation of Complete WLAN Systems in a Large Reverberation Chamber
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
Autore/i: Renzo Recanatini; Franco Moglie; Valter Mariani Primiani
Classificazione: 1 Contributo su Rivista
Abstract: This paper concerns the use of a large reverberation chamber (RC) to test a wireless local area network system based on both 802.11b/g and 802.11n standards including multiple input and multiple output (MIMO). A whole link established between commercial devices operates inside the RC under different loading conditions, varying the stirrer rotating speed and the paddle dimensions. The effects of this multipath environment on system performance are checked measuring the number of cyclic redundancy check error and the number of data retries. The comparison between the two systems is done adopting the same chamber loading condition and also stressing the system reducing the load, up to the link connection limit. Results show the higher performance of the MIMO system, able to maintain a 6-Mb/s data rate connection also with a chamber quality factor of 21 000. The same RC is used to carry out a radiated immunity test. The undesired signal is both a modulated and continuous wave injected into the active channel and into adjacent channels. Results reveal the high robustness of the 802.11n standard with respect to b and g standards when it operates in a hostile environment reproduced by an RC
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/86573 Collegamento a IRIS

2013 Determination of the Reverberation Chamber Stirrer Uncorrelated Positions by Means of the Spatial and Frequency Correlation Matrix
Proceeding of 2013 International Symposium on Electromagnetic Compatibility (EMC EUROPE)
Autore/i: Gabriele Gradoni; Valter Mariani Primiani; Franco Moglie
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The uncorrelated stirrer positions of a reverberation chamber are computed by means of Pearson's correlation matrix. Two methods are adopted to populate the matrix, and results are compared with those given by standard method. The former uses the total electric field magnitudes sampled in a large spatial lattice in the working volume for each stirrer position. The latter uses the same quantity sampled within a frequency band for a single point in the working volume for each stirrer position. Results returned by the two methods are compared for a large chamber equipped by a rotating carousel stirrer.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/127668 Collegamento a IRIS

2013 Carousel Stirrer Efficiency Evaluation by a Volumetric Lattice-Based Correlation Matrix
Proceedings of 2013 IEEE International Symposium on Electromagnetic Compatibility (EMC)
Autore/i: Gabriele Gradoni; Valter Mariani Primiani; Franco Moglie
Editore: IEEE / Institute of Electrical and Electronics Engineers Incorporated:445 Hoes Lane:Piscataway, NJ 08854:(800)701-4333, (732)981-0060, EMAIL: subscription-service@ieee.org, INTERNET: http://www.ieee.org, Fax: (732)981-9667
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Recently, a new stirrer shape, the carousel stirrer, has been proposed to improve the reverberation chamber performances. In this contribution, we propose a method to compute the number of uncorrelated positions of the carousel stirrer. This method works by counting the low-correlation elements of a 3D lattice-based correlation matrix, each elements of the matrix being the Pearson correlation between two random vectors sampled at two different stirrer locations. We use adhoc FDTD code to simulate the Cartesian fields within the reverberation (lattice) region, for a large number of stirrer positions. Our analysis highlights dependence on the considered volume dimensions, the number of lattice field samples, and their spatial distance. The study also reveals the presence of periodic frequencies where uncorrelation dramatically reduces. A parametric analysis is presented to investigate the reason of this phenomenon which is evident only for two Cartesian field components.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/127670 Collegamento a IRIS

2013 Stochastic differential equation for wave diffusion in random media
Proceedings of 2013 International Conference on Electromagnetics in Advanced Applications (ICEAA)
Autore/i: Gabriele Gradoni; Roberto Pastore; Davide Micheli; Franco Moglie; Valter Mariani Primiani; Mario Marchetti
Editore: IEEE / Institute of Electrical and Electronics Engineers Incorporated:445 Hoes Lane:Piscataway, NJ 08854:(800)701-4333, (732)981-0060, EMAIL: subscription-service@ieee.org, INTERNET: http://www.ieee.org, Fax: (732)981-9667
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this work, we present a statistical analysis of the wave motion through random media with perfect spatial disorder of inclusions. It is assumed that such a disorder can be tackled with the random potential function theory, whence the propagation of waves naturally turns to a diffusion process. The associated Itoô drift-diffusion process, and its Fokker-Planck equation are derived. It is found that the “ensemble” wave, i.e., the collective wave motion, fluctuates in space as a geometric Brownian motion. Finally, the effect of a double-well potential with random (vibrating) valleys is studied qualitatively by the Monte Carlo method. In practice, this situation occurs for high concentration and perfect dispersion of conductive/dielectric fillers, i.e., whose location and orientation are completely randomized.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/127462 Collegamento a IRIS

2013 Stirrer Performance of Reverberation Chambers Evaluated by Time Domain Fidelity
Proceedings of 2013 IEEE International Symposium on Electromagnetic Compatibility (EMC)
Autore/i: Giuseppe Esposito; Gabriele Gradoni; Franco Moglie; Valter Mariani Primiani
Editore: IEEE / Institute of Electrical and Electronics Engineers Incorporated:445 Hoes Lane:Piscataway, NJ 08854:(800)701-4333, (732)981-0060, EMAIL: subscription-service@ieee.org, INTERNET: http://www.ieee.org, Fax: (732)981-9667
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The fidelity variation is considered inside a reverberation chamber. In particular, the scattering fidelity represents the decay law of the residual correlation between two cavity realizations. It is found that the fidelity is highly sensitive to stirrer geometry variations. Pertaining the chamber loading, the fidelity is also capable to reveal different location of absorbing materials. Results were also checked in terms of repeatability showing good reliability.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/127669 Collegamento a IRIS

2013 Determination of the electrical conductivity of carbon/carbon at high microwave frequencies
CARBON
Autore/i: Gabriele Gradoni; Davide Micheli; Valter Mariani Primiani; Franco Moglie; Mario Marchetti
Classificazione: 1 Contributo su Rivista
Abstract: We present an accurate measurement of the electrical conductivity of carbon/carbon (C/C) composites in higher range of microwave frequencies. The composite is an 8 mm thick C/C laminate 2D woven fabric, machined to create a rectangular waveguide. Transmission and reflection parameters are acquired within a broad frequency band, ranging from 23 to 30 GHz, and used for the evaluation of the power loss in the waveguide and to extract the C/C electrical conductivity. The obtained conductivity values at microwave frequencies are about ten times lower than those measured at very low frequencies. The effects of temperature are also investigated, and the variation of the conductivity with the temperature is reported.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/82793 Collegamento a IRIS

2013 Electromagnetic shielding of thermal protection system for hypersonic vehicles
ACTA ASTRONAUTICA
Autore/i: M. Albano; D. Micheli; G. Gradoni; R.B. Morles; M. Marchetti; F. Moglie; V. Mariani Primiani
Classificazione: 1 Contributo su Rivista
Abstract: The numerical simulation and the measurement of electromagnetic shielding at microwave frequencies of thermal protection system for hypersonic vehicles is presented using nested reverberation chamber. An example of a possible thermal protection system for a re-entry vehicle is presented. This system, based on carbon material is electromagnetically characterized. The characterization takes into account not only the materials but the final assembly configuration of the thermal protection system. The frequency range is 2–8 GHz. The results of measurements and simulations show that the microwave shielding effectiveness of carbon materials is above 60 dB for a single tile and that the tile inter-distance is able to downgrade the shielding effectiveness on the average to about 40 dB.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/86640 Collegamento a IRIS

2013 Reduction of satellite electromagnetic scattering by carbon nanostructured multilayers
ACTA ASTRONAUTICA
Autore/i: Davide Micheli; Roberto Pastore; Gabriele Gradoni; Valter Mariani Primiani; Franco Moglie; Mario Marchetti
Classificazione: 1 Contributo su Rivista
Abstract: We propose a low observable satellite covered by layered materials. The dielectric properties of the composite materials are analyzed using the coaxial air-line method. Our solution could result in cost-effective applications for satellite stealthness. The particle swarm optimization algorithm is used to design and optimize layered absorbers. The obtained reflection is below −20 dB in many frequency subranges, also under an oblique incident condition, within the band 2–18 GHz. The optimized layered absorbers are used as a cloack for cube satellites. In particular, we investigated a very simple geometry by using a finite element commercial software in the band from 2 to 18. Finally, the transmission through an aperture on the satellite surface is analyzed. It is highlighted that the optimized layered absorbers attenuate the electric field within the satellite, improving its immunity against electromagnetic interferences.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/89861 Collegamento a IRIS

2012 Dispositivo di ausilio per non vedenti
Autore/i: Graziano, Cerri; Alfredo De, Leo; Valter Mariani, Primiani; Paola, Russo; Lorenzo, Scalise
Classificazione: 6 Brevetti
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/83225 Collegamento a IRIS

2012 Radiated susceptibility of breath monitoring system based on UWB pulses in spacecraft modules
Proceedings of the International Symposium on Electromagnetic compatibility- EMC Europe 2012
Autore/i: Paola Russo; Valter Mariani Primiani; Alfredo De Leo; Graziano Cerri
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The paper describes some EMC aspects related to a UWB radar for monitoring astronauts breathing activity. In particular the susceptibility problems are analysed. Both the standard susceptibility requirements and the functional susceptibility are considered. In particular this last aspect is fundamental for the design of a robust post processing tool for the calculation of the breathing frequency
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/80214 Collegamento a IRIS

2012 Rigorous electromagnetic model of an induction cooking system
IET SCIENCE, MEASUREMENT & TECHNOLOGY
Autore/i: Mariani Primiani V.; Kovyryalov S.; Cerri G.
Classificazione: 1 Contributo su Rivista
Abstract: An electromagnetic model of an induction cooking system and its numerical solution are proposed. The analytical approach for the whole system is based on a field theory concept. Currents in each part of the system, as well as the electric and magnetic fields generated by these currents are defined and composed into a system representing the material constitutive equations. A numerical solution of the electromagnetic problem that provides all the electric and magnetic currents of the system is achieved by application of the moment method. Finally, the proposed model has been validated experimentally by measuring the input impedance at the feeding port and comparing it with the calculated values.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/78946 Collegamento a IRIS

2012 Radiated emission and susceptibility of breath monitoring system based on UWB pulses in spacecraft modules
PROCEEDINGS OF THE XIX RINEM
Autore/i: P. RUSSO; V. MARIANI PRIMIANI; A. DE LEO; G. CERRI
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This work is included in a project of ASI, which involves several Italian entities, universities and companies, called NIMURRA, that stands for “Non Invasive Monitoring by Ultra wide band Radar of Respiratory Activity of people inside a spatial environment”. It regards the placement of a UWB radar inside a spatial module to obtain information on the respiration of astronauts. Using a pulse characterized by a very wide bandwidth in a highly resonant environment, which contains electronic instrumentation, it is necessary to consider EMC issues relating to radiated emissions, but also with regard to the susceptibility of the UWB radar itself. The objective of the work is to give some useful information to the designer of the monitoring system that take into account the EMC problem. In particular considering the radiated emission and susceptibility problem we obtain some information on the maximum input signal that can be radiated by the system, and to the maximum electric field level that the system has to tolerate in order to fulfill the EMC standard.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/83231 Collegamento a IRIS

2012 Experimental Characterization of a Reverberation Chamber Excited by the Source Stirring Technique
Proceedings of the International Symposium on Electromagnetic compatibility- EMC Europe 2012
Autore/i: V. Mariani Primiani; P. Russo; G. Cerri
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The paper describes a set of measurements carried out in a reverberating chamber and aimed to characterize the field statistics when the source stirring technique is applied. Twenty antennas are used to build up the radiating system and to cover the operational frequency range 1 GHz – 3 GHz. The quartiles of the received power distributions are analyzed over a wide frequency range showing satisfactory matching with the expected theoretical distribution. Polar plots and the cumulative distribution functions (CDF) of the rectangular and total field components are also checked at several frequencies. Finally, the uniformity analysis, applied to a typical working volume, shows that the array is able to perform a source stirring of the RC field that fulfills the IEC 61000-4-21 requirements.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/83210 Collegamento a IRIS

2012 Radiated Emission of Breath Monitoring System Based on UWB Pulses in Spacecraft Modules
Proceedings ESA Workshop on Aerospace EMC, 2012
Autore/i: P. Russo; V. Mariani Primiani; A. D. Leo; G. Cerri
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The paper describes some EMC aspects related to a UWB radar for monitoring astronauts breathing activity. Compliance to EMC space standards forces some design aspects, in particular the peak voltage and the pulse waveform. Moreover some simulations were carried out to consider realistic operating condition. In the first case the interference towards a victim wifi circuit was analyzed, in the second case the effect of the environment on the radiated pulse was studied.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/77150 Collegamento a IRIS

2012 Breath detection of humans buried in a homogeneous lossy medium: a simplified analytical model
Proceedings of the International Symposium on Electromagnetic compatibility- EMC Europe 2012
Autore/i: Alfredo De Leo; Valter Mariani Primiani; Paola Russo; Desar Shahu; Valentina Di Mattia; Graziano Cerri
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The aim of this work is to highlight the paramount importance of the availability of an electromagnetic model for the design of system based on electromagnetic radiation for search and rescue operation of humans buried under different materials as debris, and snowslide. In this contribution the monitoring of the breathing activity of a man buried into a homogeneous lossy medium has been analyzed. The geometry of the scenario and the body have been simplified in order to model the electromagnetic problem of the interaction of the body and impinging field in a closed-form. In spite of the simple formulation the results are satisfactory and show how some a priori important system requirements can be obtained, as for example the most suitable working frequency range. The model is able to predict the sensitiveness in terms of phase and module variations depending on the scenario.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/80215 Collegamento a IRIS

2012 Electromagnetic Aids for Visually Impaired Users
II Convegno Nazionale Interazioni fra Campi Elettromagnetici e Biosistemi
Autore/i: Scalise L.; Mariani Primiani V.; Shahu D.; De Leo A.; Russo P.; Di Mattia V.; Cerri G.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This paper investigates the capability of an electromagnetic obstacle detection system for visually impaired persons, based on the use of a laboratory Ultra Wide Band (UWB) pulsed radar. Despite the fact that UWB pulsed radar is a laboratory system, not specifically designed for the daily mobility of visually impaired users, this work demonstrates the possibility of adopting it for that purpose
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/80076 Collegamento a IRIS

2012 Experimental Investigation of Electromagnetic Obstacle Detection for Visually Impaired Users: A Comparison With Ultrasonic Sensing
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Autore/i: Scalise L.; Mariani Primiani V.; Russo P.; Shahu D.; Di Mattia V. ; De Leo A.; Cerri G.
Classificazione: 1 Contributo su Rivista
Abstract: The use of electromagnetic (EM) fields for obstacle detection to aid mobility of visually impaired people is presented in this paper. The method proposed is based on the launch of EM pulses and on the measurement of the reflected signal which explores a region in front of the user of about 3 m. A laboratory system is set up, its performances (detecting the presence and the distance of obstacles) are investigated, and the measurements are compared with the data measured by an ultrasonic obstacle detection system. Results show that, with the EM system, all the obstacles tested (up to a minimum size of 3 cm $times$ 3 cm, at a distance of 3 m) are correctly detected, as well as some specific targets (a chain, a pole, etc.) that are not visible by the ultrasonic system. The EM system has been tested in indoor and outdoor cluttered scenarios at the presence of real obstacles (single and multiple), and in all cases, it detects their presence with a signal-to-noise ratio ranging from 10 to 23 dB. Despite the use of a laboratory system, still not specifically designed for daily use, this paper demonstrates the possibility of adopting EM field pulses for obstacle detection, highlighting advantages with respect to ultrasonic systems and addressing future research activity to design an improved ad hoc EM system.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/73307 Collegamento a IRIS

2012 DESIGN AND TESTING OF AN ANTENNA SYSTEM FOR THE SOURCE STIRRING TECHNIQUE IN REVERBERATION CHAMBERS
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
Autore/i: Mariani Primiani V.; Russo P.; Cerri G.
Classificazione: 1 Contributo su Rivista
Abstract: The paper describes the design and testing of a radiating structure developed to reverberate electromagnetic fields in shielded chambers. The radiating system consists of a set of conical broadband wire antennas, adapted to cover the operational frequency range of 1 to 3 GHz. Twenty antennas are used to build up the structure and field stirring is achieved by switching on 190 different combinations that generate field statistics and field uniformity quite similar to those of a mechanically stirred reverberation chamber (RC). All the measurements prescribed by standard and literature were carried out to test the stirring capabilities of the radiating structure, and to assess that the RC field fulfills the IEC 61000-4-21 requirements.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/73243 Collegamento a IRIS

2012 Reverberation chamber as a multivariate process: FDTD evaluation of correlation matrix and independent positions
ELECTROMAGNETIC WAVES
Autore/i: Gradoni, Gabriele; MARIANI PRIMIANI, Valter; Moglie, Franco
Classificazione: 1 Contributo su Rivista
Abstract: This paper evaluates the mode-stirring effciency in terms of uncorrelated positions of a mechanical stirrer operating inside a reverberation chamber (RC). The actual RC is simulated and viewed as a multivariate random process: the chamber field is sampled in a lattice of spatial points distributed uniformly over a volume of arbitrary dimensions. By adopting such a grid, the stirrer effciency is then computed through the correlation matrix, accounting for the residual correlation between stirrer positions. The second-order statistics are calculated averaging over the sampling volume. Results are presented for two stirrers that move in both synchronous and interleaved mode. A comparison with the traditional circular correlation (CC) method, for the determination of the uncorrelated positions, is done showing how CC overestimates stirrer effciency.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/81947 Collegamento a IRIS


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