A Geometric Optics Congruent Monte Carlo Model for Reverberation Chambers

Abstract

The EM fields in a Reverberation Chamber (RC) can be described by a summation of plane waves from random angles with random phases and polarizations. In a well stirred RC, it is assumed there are sufficient number of plane waves, so the summation of the fields follows the well-known statistical distributions. Some researchers assumed a constant magnitude for the plane waves, while others assume a random distribution. Obviously the constant magnitude assumption is not physical in an actual cavity, as it would violate the conservation of energy. As a result, the model cannot simulate the Power Delay Profiles (PDP) in an actual RC. It was shown that the random distribution for the plane wave magnitude also produces unsatisfactory PDPs, and cannot match results from a Geometric Optics (GO) model. In addition, these models do not lend themselves well to simulate losses in a chamber. In this study, we propose a more physical model which is congruent with the behaviors predicted by the GO model. Monte Carlo simulation using the proposed model is then checked against the well-established statistical model in a RC.