Analysis of a Passive Circular Loop Antenna Radiating in the Presence of a Layered Chiral Sphere Using Method of Moments

In this paper, electromagnetic radiation due to a passive thin circular loop antenna when placed on the surface of a two-layered chiral sphere is analyzed and its far-zone radiation patterns are obtained. The method of moments is employed in this analysis to formulate the current distribution along the circular loop in the presence of the layered chiral sphere. The dyadic Green's functions defining electromagnetic fields due to source in the outer region are applied. In the Galerkin's procedure for the method of moments, basis functions used in the work are sine and cosine functions which form a Fourier series in the expansion. Effects of various geometrical and dielectric parameters of the chiral sphere are discussed. Associated with these parameters, waves and fields in such an electromagnetic system are characterized and discussed.