Statistics of Electromagnetic Fields Within Reverberant Nested Cavities When Coupled by Slotted Apertures

An experimental study has been performed to understand the behavior of the received power within a nested reverberant cavity. Two groups of slotted apertures were used for coupling between cavities: Group 1 included apertures of equal length, but varying quantity and Group 2 was a single aperture of varying length. The Anderson-Darling and Pearson's Chi-Squared goodness-of-fit tests were used to test the data against the exponential distribution and K -distribution (KD), respectively, at a 95 % confidence. The KD was shown to provide a good-fit for apertures of varying quantity and length. It was also observed that as the number independent and equivalent coupling mechanisms increased, the KD approached an exponential distribution. For electrically long apertures, it was shown that the number of statistically independent coupling mechanisms is equivalently defined as an integer multiple of half-wavelengths. Additional information regarding the behavior of the KD is presented.