Average Number of Significant Modes Excited in a Mode-Stirred Reverberation Chamber

Monsef, Florian; Cozza, Andréa

doi:10.1109/temc.2013.2284924

Cited by 25 publications

(28 citation statements)

References 18 publications

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“…Luckily enough, there hasn't been any controversy against the ergodic hypothesis among RC users! When applied to RCs, the ergodic hypothesis finds a good ground in a simple intuition, nicely explained in [3]. Assuming that the cavity is overmoded and each contributing mode is excited with (approximately) the same level, then the overlap of many contributing resonant modes at a given frequency of excitation, is equal to an aggregation (in time) of contributions from one single resonant mode when properly stirred.…”

Section: Not Enough: a Cavity Resonator Is Not A Reverberation Chambermentioning

confidence: 93%

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Reverberation chambers a la carte: An overview of the different mode-stirring techniques

Serra

Marvin

Moglie

et al. 2017

IEEE Electromagn. Compat. Mag.

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Section: Not Enough: a Cavity Resonator Is Not A Reverberation Chambermentioning

confidence: 93%

“…3 The usefulness of such a statistically uniform field in, for instance, immunity tests is evident. The equipment under test (EUT) would be subject to the same field (statistically) regardless of its location and orientation inside the chamber.…”

Section: Statistical Field Uniformitymentioning

confidence: 99%

Reverberation chambers a la carte: An overview of the different mode-stirring techniques

Serra

Marvin

Moglie

et al. 2017

IEEE Electromagn. Compat. Mag.

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“…The latter observation is typical for semi-reverberant spaces, where single, high Q-factor resonances or large apertures exist, which become dominant over the average diffused fields. Those cases can be compared to undermoded chambers [11], in which also only a limited number of significant modes is excited [32]. In such a case, the requirements regarding consistent statistical field uniformity and isotropy are less likely to be met.…”

Section: Reverberant Environment Analysismentioning

confidence: 99%

Electromagnetic fields in reverberant environments

Vogt-Ardatjew¹

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SummaryThe phenomenon of resonating electromagnetic (EM) fields has been commonly and successfully exploited in reverberation chambers (RC) for the purpose of electromagnetic compatibility (EMC) testing, as well as modeling multipath environments. An RC is designed to maximize the amount of reflections while minimizing the losses, thus creating a statistically uniform, isotropic, and randomly polarized field. Due to the desired very high complexity of such a field, its description is best done statistically. Although largely successful, the currently used statistical models allow for a certain degree of freedom, especially with regard to defining the extreme field strengths, which are also the main cause of electromagnetic interference (EMI). Furthermore, some actual multipath, enclosed environments such as airplane fuselages, ships, or even building interiors, can unintentionally possess the ability to create enough strong reflections so that the resulting resonating EM field within them resembles the field inside a dedicated RC. Those reverberant environments (RE) can therefore utilize the methods and techniques similar to the ones used in laboratory conditions. Due to the very high complexity and diversity, resulting in increased difficulty of both numerical or analytical description of the REs, the analysis performed throughout this work is mainly experimental. Such an approach allows to bypass the often unreasonable or too generalized assumptions of the available models while utilizing purely empirical data.The initial step made in this thesis focuses on introducing REs as environments sharing multiple aspects of EM field shaping with RCs. The experimental analysis has been performed on two example REs by means of quality factor (Q-factor), insertion loss (IL), as well as goodness of fit (GOF) tests. The results, although highly variable with frequency, indicate a possible similarity to a referential RC analyzed alongside. Furthermore, due to the difficulty of collecting large amounts of data and parameter isolation in the REs, two dedicated chambers: a classical RC and the vibrating intrinsic reverberation chamber (VIRC), have been analyzed as candidates allowing to simulate an RE in laboratory conditions. By the means of Q-factor, k-factor, GOF, as well as number of samples, related to field repeatability, it has been shown that the VIRC provides substantially better conditions for the given purpose.The search of maximum field strengths in reverberant environments has been performed by exploiting the capability of the VIRC to efficiently generate large amounts of independent samples. Performing 1-hour long measurements in the VIRC allows to obtain the desired results with very high repeatability, while giving space for parameter isolation. The first hypothesis states that the maximum-to-average (max/avg) electric field ratio depends on the losses of the environment. The measurement campaign performed to test it consisted of multiple setups with highly spread Q-factors, additionally creating a link between...

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“…To this end, we refer to a recent work [5] which aims at deriving the variability of the electric-energy density. Unlike in [5], we present an approach that does not make use of the statistical-bandwidth concept.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike in [5], we present an approach that does not make use of the statistical-bandwidth concept. After a brief summary of the field model in Section II, we will proceed to the derivation of the power variability in Section III.…”

Section: Introductionmentioning

confidence: 99%

Variability and Confidence Intervals of the Power Measured in a Reverberation Chamber

Monsef¹,

Cozza²

2014

IEEE Trans. Electromagn. Compat.

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International audienceThe relative variance (or variability) of the average power measured in a reverberation chamber is derived. It is found to be a function of the average number of modes overlapping in the average modal bandwidth found at the working frequency. The model can predict the average-power variance from under- to over-moded regimes. Good agreement with experimental and simulation data is obtained. Confidence intervals of the estimate of the average-power variability are computed for different chamber regimes and a varying number of independent stirrer positions

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Average Number of Significant Modes Excited in a Mode-Stirred Reverberation Chamber

Cited by 25 publications

References 18 publications

Reverberation chambers a la carte: An overview of the different mode-stirring techniques

Reverberation chambers a la carte: An overview of the different mode-stirring techniques

Electromagnetic fields in reverberant environments

Variability and Confidence Intervals of the Power Measured in a Reverberation Chamber

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