Electromagnetic scattering of conducting targets located above lossy half-space is analyzed with multilevel fast multipole algorithm (MLFMA).In order to expand half space Green's functions with addition theorem,a high order approximation method is proposed for evaluation of reflection term of half-space Green's functions with far interactions.A careful investigation is presented to confirm accuracy of the Green's function analysis.Accuracy and efficiency of the proposed method is examined by several numerical applications.It demonstrates that the proposed method has merit of low memory requirement and simple operation.

Electromagnetic scattering of arbitrarily shaped 3-D homogenous dielectric objects located above a lossy half space is investigated.With spatial domain half-space Green's functions surface integral equations are studied to reduce iterations and to enhance efficiency of the method of moment(MoM).An integral equation called JMCFIE is extended to half-space to realize accurate and fast solution.This formulation leads to a well-conditioned matrix equation with RWG basis functions and Galerkin's method.Numerical results demonstrate accuracy and efficiency of the proposed method.