Arnaut, L R; Rochard, O C (2002) Distributions of field magnitude and energy density in undermoded mode-tuned reverberation chambers. In: 5th European Symposium on EMC, 9-13 September 2002, Sorrento, Italy.

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Abstract

Results are presented on two fully analytical approaches to the problem of statistical characterization of imperfect reverberation inside undermoded reverberation chambers, and validated against measured data. Firstly, a principal component decomposition of partially polarized fields is performed which yields a compound exponential distribution for the energy density or magnitude of the total field. Secondly, by considering the complex cavity field as a doubly stochastic process with a random number of contributing modes or plane-wave components, asymptotic Bessel K distributions for the field magnitude and energy density are obtained. Both characterizations employ additional distribution parameters to allow for continuous transitions away from distributions for ideal reverberation. A comparison with measured data demonstrates improved agreement in both cases, particularly at relatively high test levels. These results allow for more accurate calculation of uncertainties and confidence levels for EMC test statistics in undermoded chambers and extended use of such chambers towards lower frequencies.

Item Type:	Conference or Workshop Item (UNSPECIFIED)
Subjects:	Electromagnetics
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/2500

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