Efficient Solution of Wideband RCS Using Wideband Characteristic Mode Basis Function Method With Impedance Interpolation

An efficient method for wideband radar cross section (RCS) calculation is proposed in this paper. In this method, the characteristic modes (CMs) extracted at the highest frequency are used as wideband basis functions to compute the broadband RCS. During this process, an interpolation method is adopted to accelerate the generation of original impedance matrix. Compared with the convenient method of moment (MoM), the proposed method is more efficient as it reduces the dimension of the impedance matrix at each operation frequency. Numerical results of perfectly electric conducting (PEC) models are demonstrated to validate the accuracy and efficiency.