Abstract

The electromagnetic field of a circular loop antenna of radius a, carrying a nonuniform current I(ϕ), in the presence of a conducting sphere of radius b<a located symmetrically is considered. The current distribution on the thin-wire circular loop driven by a delta-function generator is determined by a Fourier series expansion in terms of tesseral harmonics. Eigenfunction series solutions for the field are assumed in different regions. The unknown coefficients are computed by enforcing boundary conditions at the interfaces of these different regions. Field components are obtained analytically in closed form and field patterns are plotted for various cases.

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