On the Field Statistics in Nested Reverberation Chambers

We study the normalized field statistics inside nested reverberation chambers (NRCs), through the analysis of the shielding effectiveness of enclosures and material samples. The accurate knowledge of field statistics allows to improve the estimation of probability distributions for high field values inside electrically large enclosures. Furthermore, the study allows for better selection of the measurement model for both shielding effectiveness of enclosures and materials and gaskets. We find the correct procedures to achieve such distributions. We study basic cases of single and electrically small coupling apertures filtering single or double field components and we show the theoretical statistics of the field components inside NRCs. The change of inner field distributions is driven by the electrical size of coupling apertures and has been verified experimentally. The theory developed to obtain such statistics is based upon physics and the results are supported by measurements. The procedures and results shown in this paper are applicable to predict the statistics in NRCs as well as in adjacent RCs.