Hybrid PMM-MOM method for the analysis of finite periodic structures

In this paper, a hybrid method (hybrid PMM-MOM method) is presented for the effective and accurate analysis of finite periodic structures. This method divides the finite periodic structure into two parts. The inner part of an approximate infinite periodic structure is analyzed by periodic method of moment (PMM), and the outer part is then analyzed by method of moments (MOM). For the finite periodic structures, the accuracy of the new method is much better than that of the pure PMM and almost the same as that of pure MOM. Because pure PMM uses periodic boundary conditions, it takes much less memory resources and computation time. For hybrid PMM-MOM method, because the inner part is calculated by PMM, the calculation work concentrates on the outer part. Consequently, compared with the exact MOM, the new method saves much more memory resources and computation time, which provides a drastic reduction of unknowns.