Calculated and Measured Absorption Cross Sections of Lossy Objects in Reverberation Chamber

Carlberg, Ulf; Kildal, Per-Simon; Wolfgang, Andreas; Sotoudeh, Omid; Orlenius, Charlie

doi:10.1109/temc.2004.826878

Cited by 91 publications

(53 citation statements)

References 10 publications

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“…The interaction be-tween each plane wave of the summation and the sample under test is treated by the finite-difference time-domain (FDTD) method using an ad-hoc numerical code. The knowledge of the absorbed power allows to retrieve the absorption cross section (ACS) of the material [30,31] and RCS [32]. From a practical point of view, the ACS is recovered measuring the quality factor (Q factor) variation between the empty chamber condition and the loaded chamber condition, when the sample is inserted in.…”

Section: Introductionmentioning

confidence: 99%

Absorbing Cross Section in Reverberation Chamber: Experimental and Numerical Results

Gradoni¹,

Micheli²,

Moglie³

et al. 2012

PIER B

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Abstract-Reverberation chamber (RC) test facility allows to determine the absorbing cross section (ACS) of lossy materials under a random field excitation. Measurements are based on the quality factor variation produced by the sample under test presence with respect to the empty chamber condition. Simulations are based on the representation of the RC electromagnetic field by means of a random plane wave superposition. A finite-difference time-domain code is used to compute the material absorbed power and to recover a numerical ACS. The method sensibility is stressed by application to small size samples. Comparison between numerical and experimental data reveals a satisfactory agreement. Results for different materials are presented in the paper: soft foam absorbers, carbon foam sheets, and carbon/carbon sheets.

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Section: Introductionmentioning

confidence: 99%

Absorbing Cross Section in Reverberation Chamber: Experimental and Numerical Results

Gradoni¹,

Micheli²,

Moglie³

et al. 2012

PIER B

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“…A range of commercially available carbon-loaded polyurethane foam RAM types were investigated [18]. For each type a three-pole Debye dispersion relationship (11) was fitted to the manufacturer's complex permittivity data using a genetic algorithm. Here is the angular frequency, the permittivity of free-space and the other fitted parameters are shown in Table I.…”

Section: B Ram Based Recomentioning

confidence: 99%

“…In brief, the mismatch corrected insertion loss between two monopole antennas in the chamber was measured, both with and without the ReCo inside. The additivity of AACS then allows the AACS of the ReCo to be determined from the average power balance of the chamber [11].…”

Section: Validation Measurementsmentioning

confidence: 99%

“…This analysis shows that the planewave absorption cross-section (ACS) of a printed circuit board (PCB) averaged over angles of arrival and polarizations of the incident plane-wave is the intrinsic property of a PCB that determines its loading effect on an enclosure and hence the perturbation in SE caused by the contents. Such an average ACS (AACS) can be measured in a reverberation chamber (RC) [11]. A database of measured AACSs for real PCBs taken from information and communication technology (ICT) equipment was reported in [10]; according to the PWB analysis such measured AACS data can be used to calibrate ReCos for SE measurements.…”

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confidence: 99%

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Representative Contents Design for Shielding Enclosure Qualification From 2 to 20 GHz

Flintoft

Bale

Marvin

et al. 2018

IEEE Trans. Electromagn. Compat.

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Abstract-The electromagnetic environment inside a shielding enclosure is affected by the absorption characteristics of the contents, which should therefore be represented in shielding measurements and simulations. At frequencies up to a few gigahertz, lossy dielectric materials have previously been used as surrogates for printed circuit boards in enclosure shielding assessment, both experimentally and in simulations. However, no systematic methodology for the design of these surrogates and their calibration against real hardware at high frequencies has been elucidated. In this paper we show how both lossy dielectric material and microstrip transmission line based "representative contents" can be designed and calibrated against real printed circuit boards over the frequency range 2-20 GHz using power balance concepts. The calibration is made by matching the average absorption cross-section of the surrogate to an average value for a class of real contents measured in a reverberation chamber. The surrogates are designed using efficient power balance models for layered media and field-excited microstrip lines and verified using full-wave simulation. The fabricated surrogates are validated by shielding measurements. The methodology presented could form an important part of future standards for enclosure qualification measurements that more accurately represent the internal environment of real equipment.

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“…According to [8], Q-factor (losses) may be derived from the sum of various components mainly related to absorbers Q a and other sources of losses Q o (walls, antennas, scatterers). If the absorbing cross section (ACS) may be derived from Q a measurements [9], the computation of the TSCS from simulated RC E-fields may appear particularly important. A double interest exists to compute ACS and TSCS in MSRC.…”

Section: Theoretical Principlesmentioning

confidence: 99%

Numerical Total Scattering Cross Section From Reverberating Electromagnetic Experiments

Baba¹,

Lalléchère²,

Bonnet³

2010

PIER Letters

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Abstract-The total scattering cross section (TSCS) of various targets is computed in this letter from a numerical method in a reverberation chamber (RC). Theoretically TSCS measurements need both a free-space environment (for instance anechoic chamber modeled numerically by absorbing boundary conditions) and various plane waves' stimulations. The method developed allows predicting the TSCS from few simulations in a RC. The foundations and numerical results presented demonstrate the ability of the technique to straightforward compute the TSCS with the finite difference in time domain (FDTD) method. The agreement from these TSCS treatments in RC is finally obtained considering the expected results in free-space.

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Calculated and Measured Absorption Cross Sections of Lossy Objects in Reverberation Chamber

Cited by 91 publications

References 10 publications

Absorbing Cross Section in Reverberation Chamber: Experimental and Numerical Results

Absorbing Cross Section in Reverberation Chamber: Experimental and Numerical Results

Representative Contents Design for Shielding Enclosure Qualification From 2 to 20 GHz

Numerical Total Scattering Cross Section From Reverberating Electromagnetic Experiments

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