Experimental validation of Lomax Unconditional PDF Model for Mixed Direct and Reverberant Electric Fields Inside a Complex Enclosure

The authors have recently shown how stochastic power balance (SPB) extensions to reverberation chamber statistics theory can address the under-moded statistics of electrically small enclosures and how the typically high level of uncertainty in the enclosure Q factor can be incorporated in system-level EMC models. A third challenge is that the construction and contents of a typical electronics enclosure may have a low enough Q factor at some frequencies, such that the reverberant EM field level is lower than the direct field level and/or the coherent reflection field level. This paper reports work on the addition of direct field models to the SPB model to predict the statistical distribution of the combined field at any location in the enclosure. Preliminary experimental results confirm that the resulting non-central probability density function model is valid and useful for a wide range of applications.