Asymptotic Solution to the Scattering By Anisotropic Spheroids

In this work we investigate the electromagnetic scattering by a prolate anisotropic spheroid. We develop an asymptotic method where, for small values of spheroid's eccentricity, the latter is treated as a perturbation of the respective anisotropic sphere. Spherical vector wave functions (SVWFs) with discrete wavenumbers are used for the expansion of the fields in the region of anisotropy. Satisfying the boundary conditions at the perturbed spheroidal surface, we finally obtain a simple algebraic expression for the bistatic radar cross section (RCS), valid for small eccentricities. Comparisons of the developed method with HFSS are performed, and numerical results are given for RCS computations.