Hybrid PMM-MOM method for analyzing the RCS of finite array

In this paper, a hybrid method (hybrid PMM-MOM method) is presented for effectively and accurately analyzing the RCS of finite array. This method divides the finite array 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). The accuracy of the new method is much better than that of the pure PMM, and is almost the same as that of pure MOM. As for the memory, because pure PMM uses the periodic conditions, it takes up much less memory resources. For hybrid PMM-MOM method, because the inner part is calculated by PMM, the calculation work concentrates on the outer part. Consequently, compared to the exact MOM, the new method saves much more memory resources and computation time, which provides a drastic reduction of unknowns.