Reliable Finite-Difference Time-Domain Simulations of Reverberation Chambers by Using Equivalent Volumetric Losses


A numerical code primarily based on the finite-difference time-domain technique is adopted to simulate a giant reverberation chamber as well as the stirrers and the particular antenna presence in the frequency range 200–1000 MHz. The power of the code lies within the parallelization that allows the execution on high-performance computers. Chamber losses are accounted for by introducing virtual volumetric losses within the hypothesis of ideal conductor walls. The correction that arises from this alternative which permits us to hurry up the numerical computation is verified by a comparison with the case of wall losses implemented by assuming a finite conductivity. The analysis of the statistics of the chamber field, stirrer uncorrelated positions, Rician K-factor, backscatter, and field uniformity returns overlapping results for the two techniques. The analysis of the spatial field correlation at intervals a spatial grid shows a correlation greater than zero.five in the full frequency range and for all stirrer angles, therefore confirming the equivalence of the 2 ways to manage losses.

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