Iterative solvers in frequency analysis of complex structures based on MoM solution of surface integral equations

Many problems in radar scattering, antenna and microwave fields can be solved by applying the method of moments (MoM) to the surface integral equations (SIEs). The geometry of the analyzed structure is usually modeled by triangular or quadrilateral patches. In particular, very efficient analysis can be achieved by using higher order basis functions that automatically satisfy the continuity equation for the currents at the patch ends and junctions. The goal of this paper is to investigate different iterative methods and possibly find in which classes of problems they have an advantage with respect to the direct method. First a survey of the investigated method is given. Then, numerical results for different classes of structures are presented. Based on these results recommendations are given.