Abstract:

Analysis of electromagnetic scattering from objects is of significant importance in both theoretical researches and practical applications. Traditional algorithms, say the method of moments (MOM), has been widely used in this field during the past decades. However, with the increase of electric size of objects under consideration, a huge requirement of the in-core memory and the complexity of operations are inevitable in MOM. Macro-basis-function-like approaches circumvent the bottlenecks by generating the sets of high-level basis functions defined over macro domains, and give a rise to a considerable reduction in the number of unknowns, i.e. the scale of matrix equations, hence large scale problems become manageable. The characteristic basis function method (CBFM), one of the promising approaches, is under discussion. Modified CBFM, taking advantage of physical optics (PO) and spherical harmonics expansion-multilevel fast multipole method, is utilized to analyze electromagnetic scattering problems, especially with multiple excitations. Several numerical results are given to demonstrate the accuracy and efficiency of the proposed algorithm.