Modeling of reverberation chamber using FMM-Accelerated hybrid integral equation

Iterative solvers suffer from slow convergence in modeling a highly resonant reverberation chamber (RC). In this paper, a hybrid integral equation accelerated by the fast multiple method (FMM) is utilized to model RC and to improve the convergence behavior. The hybrid method´s performance is studied and the error introduced by the FMM is analyzed. It is found that the truncation error of multi-pole expansion can be significant in some cases, which may become critical in modeling highly resonant structures like the RC.