An Alternative Representation of Magnetic Green's Dyadics in a Spherical-Shell Dielectric Radome

Abstract

In electromagnetic boundary value problems, the Green's dyadic has been an important kernal for electromagnetic field integral representations involving an arbitrary current distribution. An simple form of the Green's dyadic can make the problem-solving easier. In this paper, an alternative representation of magnetic dyadic Green's functions for the regions separated by a spherical radome shell is formulated by applying the principle of scattering superposition. Furthermore, their transmission and reflection coefficients of the scattering dyadic Green's functions are obtained using the boundary conditions on the interfaces. This new dyadic form provides a straightforward and convenient way for obtaining the general expression of the electromagnetic fields in the spherically layered medium (without making coordinate transformation).