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Correlation matrix methods to assess the stirring performance of electromagnetic reverberation chambers

Gradoni, Gabriele; Moglie, Franco; Mariani Primiani, Valter

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Authors

Gabriele Gradoni

Franco Moglie

Valter Mariani Primiani



Abstract

© 2018 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.

Journal Article Type Article
Acceptance Date Sep 10, 2018
Online Publication Date Sep 18, 2018
Publication Date 2019-04
Deposit Date Dec 11, 2018
Publicly Available Date Sep 19, 2019
Journal Wave Motion
Print ISSN 0165-2125
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 87
Pages 213-226
DOI https://doi.org/10.1016/j.wavemoti.2018.09.008
Keywords Reverberation chamber; Correlation; Entropy; Cavity; Statistics
Public URL https://nottingham-repository.worktribe.com/output/1406353
Publisher URL https://www.sciencedirect.com/science/article/pii/S0165212518303858

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