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Compound exponential distribution for undermoded reverberation chambers.

Arnaut, L R (2002) Compound exponential distribution for undermoded reverberation chambers. IEEE Trans. Electromagn. Compat., 44 (3). pp. 442-457.

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Novel theoretical first-order probability density functions are derived for the energy density and magnitude of elec-tromagnetic fields inside mode-tuned or mode-stirred reverbera-tion chambers operated at relatively low frequencies. Deviations of physical characteristics for fields in undermoded chambers from those for ideal reverberation are quantified. These deviations are then used as parameters of the distributions. The distribution pa-rameters can be easily and independently calculated from the mea-sured tuner sweep data functions. The derivation is based on an eigenvalue decomposition of the 3 x 3 polarization matrix for the stir-averaged local field, followed by a polarization decomposition of the principal components. The theoretical distributions are com-pared with measured data, showing improved agreement and a sig-nificantly lower mismatch at lower frequencies compared to ideal x6(2) distributions. The previously observed “flattening” of the cu-mulative distribution function is confirmed, resulting in a now cal-culable decrease of the mean value and an increase of the uncer-tainty for field statistics as frequency is lowered.

Item Type: Article
Keywords: eigenvalue decomposition, entropy, Hilbert transformation, mode-stirred chamber, partial polarization
Subjects: Electromagnetics
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2447

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