Fast analysis of wideband electromagnetic scattering from multi-objects based on characteristic basis function method

The asymptotic waveform evaluation (AWE) is an efficient method for analyzing wideband electromagnetic scattering problems. As the number of unknowns increases, the size of MOM impedance matrix grows very rapidly, so it is a prohibitive task for the computation of wideband radar cross section (RCS) from electrically large objects or multi-objects using the traditional AWE technique. The characteristic basis function method (CBFM) is a novel efficient approach for reducing the matrix size to a manageable size for direct matrix inversion. In this paper, the AWE technique based on the CBFM for analyzing electromagnetic scattering from multi-objects over a given frequency band is proposed. Numerical examples are given to illustrate the accuracy and computational efficiency of the proposed method.