Statistical Analysis of Random Boundary Conditions in a Reverberation Chamber

In this paper, a comprehensive statistical analysis of the Reverberation Chamber with random boundaries and a mechanical stirrer is performed to evaluate the field correlation for independent positions achieved from a stirred electromagnetic field. The analysis of the reverberation chamber is conducted through numerical simulation by using a custom FDTD solver. The reverberant environment is modeled with two monopole antennas along with Ns 64 random boundaries and stirrer positions. The degree of independence among the field samples is quantified through the spatial correlation matrix, while the Kolmogorov-Smirnov (KS) statistics provides an additional measure of statistical consistency. The use of randomized boundaries enables a well-stirred field across the chamber, and even though a residual unstirred energy may occur at lower frequencies due to the limited number of resonant modes, proper matching of the chamber size to the working frequency ensures effective stirring. The addition of a mechanical stirrer further enhances field uniformity and increases the number of independent positions even for a small-volume Reverberation Chamber, providing insights for efficient chamber design and characterization.