Efficient modelling of a reverberation chamber environment in the time domain

The computational demands of modeling a reverberation chamber make it impossible to attempt directly using full field time domain computational electromagnetics techniques. In this paper a random boundary condition for the TLM method is described which has the effect of vastly lowering the resonant frequency and increasing the mode density of a cavity. Models of reverberation chamber tests may be achieved with very efficient use of computational resources. The technique is demonstrated using the examples of shielding effectiveness and transmission cross section calculations.