Aspects of field statistics inside nested frequency-stirred reverberation chambers

The magnitude of a component of the electric field E_Rec inside a single mechanical stirred chamber is known to follow Rayleigh distribution, however, for the field inside an enclosure nested in a larger chamber, the probability distribution function (PDF) of the E_Rec is unclear. In this paper the hypothesis of the PDF of a frequency stirred E_Rec is provided and then examined by a number of goodness of fit tests (K-S test). The results show that for an electrically large enclosure nested in a larger reverberation chamber, the PDF of the internal electric field E_Rec will evolve from Rayleigh to double Rayleigh with the shrinking size of the interconnection aperture. E_Rec obtained from different positions in the nested equipment enclosure were examined and found consistent; single apertures as well as multiple apertures were investigated to account for the importance of the interfacing aperture to the internal field distribution. This adds to understanding the underlying principles of nested chambers used for Shielding Effectiveness measurements.