Closed-form expressions for electromagnetic waves generated by a current loop in a uniaxial dielectric medium in the far zone

Abstract

The radiations by a current loop in an unbounded uniaxial dielectric material with uniform current distribution are studied. The closed-form expressions for the radiation in the far zone are found using the dyadic Green functions in the frequency domain. Analytical results are obtained when the axis of the loop is parallel to the optic axis and when it is perpendicular to the optic axis. Only ordinary waves are emitted when the axis of the loop is parallel to the optic axis. When the axis of the loop is perpendicular to the optic axis, both the ordinary and the extraordinary waves are emitted. The results for different radii of the loop show that the radiation pattern strongly depends upon the size of the loop.