Efficient Reconstruction of the Sensitivity Map Characterizing the Equivalence of Working Volumes in Undermoded Reverberation Chambers

The equivalence of working volumes (WV) in loaded and empty reverberation chambers (RCs) is investigated by the regime of state-of-the-art sensitivity analysis (SA) techniques while inspecting the effect of changing configuration param-eters to the field uniformity (FU) close to the lowest usable frequency (LUF). The Sobol’ indices as SA measures are evaluated at each stirrer step. For efficient calculation, different state-of-the-art surrogate modeling techniques were utilized to substitute the full-wave simulation model depending on the characteristics of the WVs. The computational expenses of the problem are further reduced by using a decreased number of stirrer steps and configurations as experimental design (ED) samples. The former is achieved by means of adaptive sampling techniques through kriging interpolation. The latter is carried out by performing convergence studies. The proposed method is able to reconstruct the sensitivity map (SM) of the configuration parameters as functions of the stirrer steps with a fewer number of samples.