Ray-Tracing-Based Dual-Domain Analysis Technique Using the Method of Moments and the Multilevel Fast Multipole Algorithm

This paper presents a technique for the full-wave analysis of large problems using the method of moments, in combination with the multilevel fast multipole algorithm, based on a decomposition of the scenario into two domains using a ray-tracing analysis. These domains are computed considering the proximity to the critical points. The currents over the main scenario are obtained first and used to modify the excitation of the secondary domain, which in turn can be analyzed using a relaxed iteration error that very noticeably reduces the iteration time without a significant impact on the accuracy. The procedure used for the separation of both domains minimizes the amount of information exchanged between them.