Numerical modelling of reverberation chamber using method of moments and Ewald summation

In order to be able to evaluate the effectiveness of stirring methods in a controlled environment, we have developed a numerical model for wire antennas in metal cavities. Our aim is not to model a particular chamber with all its detail, but to study a similar environment that will have the same statistical properties. This should be sufficient for evaluating the efficiency of different stirring techniques. We have chosen to model structures in the chamber as thin wires, and we calculate the coupling between the thin wires with the method of moments (MoM) using a cavity Green´s function. In this way we do not need any unknowns for the cavity walls. The Green´s function is calculated by the efficient Ewald summation technique. In the present paper we place two dipoles in random positions in the cavity and calculate the S-parameters