Fast numerical model of reverberation chambers with metal stirrers using moment method and cavity Green´s function calculated by Ewald summation

Reverberation chambers (RC) are metal cavities used for measuring electronic devices. When designing RCs it might be useful to have a numerical model of them. Since a RC is large in terms of wavelength this is challenging. A numerical model of a rectangular metal cavity is developed using method of moments (MoM) and a cavity Green´s function (GF). In this way, unknowns at the walls or in the volume of the cavity are not needed. Since movable parts have to be modeled, extensive computations are needed to cover all possible positions of these parts, and statistical analysis has to be used. Therefore, computational speed is very important. In the present paper, various methods used to reduce the computation time of the code and how it is implemented for perfect electric conducting thin wires and plates located inside the chamber are described