The use of correlation matrices to evaluate the number of uncorrelatedstirrer positions of reverberation chamber has widespread applications inelectromagnetic compatibility. We present a comparative study of recenttechniques based on multivariate correlation functions aimed at relatingspace-frequency inhomogeneities/anisotropies to the reduction of uncorrelatedpositions. Full wave finite-difference time domain simulations of an actualreverberation chamber are performed through an in-house parallel code. Theefficiency of this code enables for capturing extensiveinhomogeneous/anisotropic spatial volumes (frequency ranges). The concept ofthreshold crossing is revised under the light of random field sampling, whichis important to the performance of arbitrary reverberation chambers.
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