The Impact of Loading on the Equivalence of Working Volumes in Reverberation Chambers

In this paper, the equivalence of working volumes (WV) in reverberation chambers (RCs) is analyzed using sensitivity analysis (SA) techniques, focusing on how the size of the device under test (DUT) affects field uniformity (FU) near the lowest usable frequency (LUF). The Sobol’ indices as SA measures are evaluated at each stirrer step and frequency. Full-wave simulations are substituted by surrogate models to lower computational cost, combined with adaptive sampling and kriging interpolation. Furthermore, the size of the experimental design set, i.e., the number of different configurations is controlled by performing convergence studies. The method reconstructs the 2D sensitivity map with fewer samples, revealing that while the importance of the displacement of the stirrer dominates most of the parameter space, DUT volume changes can significantly impact FU in certain regions.