Application of FFT basis based on prior knowledge for fast solving wide angle EM scattering problems

摘要

Fast calculation of wide angle electromagnetic scattering problems is always a difficult but significant subject in computational electromagnetics. Aiming at this difficulty, this paper puts forward a new solution applying fast Fourier transformation (FFT) basis based on the excitation vectors of method of moments over wide incident angles as the prior knowledge to solve this kind of problem. The solution utilizes the sparse consistency between unknown currents and excitation vectors over wide angles to realize finishing calculating currents over all incident angles accurately by only a few times of traditional method of moments. Numerical results show that the solution presents a good performance for rapid solving wide angle scattering problems