NDLI: How a physical definition of overmodedness can explain local statistical non-compliancy

Content Provider	IEEE Xplore Digital Library
Author	Cozza, A. Monsef, F.
Copyright Year	2011
Description	Author affiliation: Département de Recherche en Électromagnétisme, Laboratoire des Signaux et Systèmes (L2S), UMR8506 SUPELEC - Univ Paris-Sud - CNRS, 91192 Gif sur Yvette, France (Cozza, A.; Monsef, F.)
Abstract	Current understanding of reverberation chambers is firmly funded upon their being operated as overmoded cavities. A proper definition of this condition has been lacking for a long time, while being regarded as automatically satisfied as soon as a large (and unspecified) number of normal modes are set to resonate at the frequency of operation of the chamber. In a recent work, we have introduced in a formal way a proper definition of the overmoded condition, showing how, from a strict mathematical viewpoint, it is not related to any threshold frequency, but rather requires a statistical framework. In this paper we revisit the most important results from our analysis, and show how our theory can straightforwardly explain the local non-compliancies sometimes observed for field statistics in what are deemed to be overmoded cavities. Partial overlapping between the normal modes of the cavity are shown to lead to an alternative and more physically-based explanation for this phenomenon, without invoking the concept of an ineffective stirring technique, nor the presence of unstirred components. The proposed theory is finally applied for the assessment of the relationship existing between the actual confidence margin based on the ideal properties of a reverberation chamber and those predicted by our model, showing how there is a non-negligible probability of having a large number of samples outside the original confidence margin, i.e., a potentially erroneous estimate of the true variability of a field-related quantity.
Starting Page	137
Ending Page	142
File Size	211916
Page Count	6
File Format	PDF
ISBN	9781457717093
e-ISBN	9780954114633
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-26
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	EMC Europe
Subject Keyword	Cavities Error analysis Losses Q factor Resonant frequency Electromagnetic compatibility Cavity resonators Acoustics Random variables Approximation methods Statistics
Content Type	Text
Resource Type	Article

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