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Two-region model for the fast implementation of the method of moments [computational electromagnetics]

The method of moments (MOM) has found wide applications in a variety of electromagnetic radiation and scattering problems. However, the the conventional MOM is very computationally expensive when handling large-scale problems with a large number of unknowns. In this paper, a two-region model is proposed for the fast implementation of MOM. Based on an accurate analysis, different orders of approximation are obtained to solve the MOM problem in a smaller region, where the first-order approximation looks similar to the improved physical optics-MOM formulation, but the new formulation gives better physical explanations. Numerical results validate the proposed model.