Scattering evaluation of an infinite PEC plane coated with an anisotropic medium under arbitrary source excitation

Abstract

A spectral-domain asymptotic method based on the dyadic Green’s function is proposed to study the electromagnetic (EM) scattering of an infinite perfectly conducting (PEC) plane coated with a uniaxial electric anisotropic medium (UEAM) under arbitrary source excitation. We specifically analyze the ray propagation path of the incidence wave from the individual point source, which acts at the planar-layered medium structure to obtain the dyadic Green’s functions (DGFs) of different types of EM waves. These DGFs from the reflected, transmitted, and entire secondary scattered fields are employed to establish the relationship between the arbitrary excitation source and different types of scattered fields. According to the corresponding “source-field” connection between the excitation source and the scattered field components in the spectral domain, we can first derive the expression of the spectral-domain DGF matrix components and then use the saddle point method to obtain the spatial-domain dyadic Green’s function. Finally, we use the integral equation solution to construct the scattered field for an infinite PEC plane coated with the UEAM layer under arbitrary source excitation. The comparison of simulation results from the proposed method and the method of moments (MoM) method confirms the algorithm validation. So it is expected to be a valid algorithm for dealing with electrically large and complex targets coated with the UEAM layer under any source excitation in the future.