An electromagnetic scattering reanalysis method for partial geometry modifications

Abstract

This work proposes an effective and accurate method for solving the partial geometry modification problem of original scattering. The current and scattering characteristics after structure modification can be efficiently calculated by using the information of the initial impedance matrix. These modifications include adding geometry or moving and rotating different parts of geometry. Although the changes in each impedance matrix are local for partial modified geometries, the associated computational cost is high because the whole analysis is iterative. By combining the binomial series method and the reduced basis method, the proposed method can effectively evaluate the scattering field without solving the inverse impedance matrix of the modified geometry. The proposed algorithm has a computational cost of O(n2), which is much smaller than O(n3) of the traditional method of moments (MoM), where n is the number of unknowns. Through several examples, the traditional MoM and the proposed method are compared, and the efficiency and accuracy of the proposed method are proved.