Efficient computation method for the electromagnetic scattering of complex targets

In this article, we present a fast and accurate numerical method for the computation of scattered electromagnetic field from targets of different sizes and complex shapes. The approach is based on the sampling representation of the complex reflection coefficient of the target where both amplitude and phase information are considered, rather than the usual radar cross section (RCS) where the phase information is missed. The scattering features of the target are organized in a 5-D complex matrix H calculated numerically. The electromagnetic tool (CST) computes this H matrix evaluating the scattered field in a finite number of selected directions. This number is chosen in order to obtain a good reconstruction of overall scattering feature. As assumed for the scattered field, matrix H is also calculated for the same discrete set of directions of the incident wave. Two numerical examples are provided to demonstrate the correctness and the efficiency of the proposed method.