Efficient Electromagnetic Simulation of Large Quasi-Periodic Arrays Based on FEM-BEM-DDM

In this article, a modified characteristic subdomain method is presented for analyzing large quasi-periodic arrays based on the hybrid finite element-boundary element-domain decomposition method (FEM-BEM-DDM). This technique considers the large-scale quasi-periodic array as an expansion of several characteristic units, and utilizes the identity of characteristic subdomain system matrices to save the memory consumed in the process of constructing and analyzing these matrices, which significantly improves the performance of the algorithm. By comparing with commercial software FEKO and existing FEM-BEM-DDM method, the accuracy and the efficiency of the proposed technique is validated.