The Fast Solver for Calculating the Scattered Fields From the Multiscale Scatterers

In this paper, the efficient methods for calculating the scattered fields from the electrically large scatterers and multiscale scatterers are discussed. The method of moment physical optics (MoM-PO) method is introduced to obtain the scattered fields from the multiscale scatterers. Due to the highly oscillatory behavior of the PO integrals, the numerical contour deformation technique is proposed to calculate the PO scattered fields. The z buffer acceleration technique based on General Public Utilities is adopted to distinguish between the lit and shadow regions of the surfaces. Numerical examples from the electrically large and multiscale scatterers are provided to benchmark the efficiency of the proposed method.