Abstract
The current distribution on a two-coupled circular microstrip disk antenna fed by two probes is rigorously derived using the Vector Hankel Transform. It is shown that the current on the two disks is governed by a set of vector integral equations. These equations are solved approximately for the amplitudes of the currents on the two disks, in the limit of thin substrate. Expressions for the self, mutual, and input impedances are then rigorously derived. It is shown that excitation of the odd symmetric TM11 mode can cause the two-disk antennas to act as a better radiator than the single-disk antenna, while the odd antisymmetric modes can cause the two-coupled disk structures to act as a better resonator than the single-disk structure. Expressions for the radiation pattern are then derived, and the impedance parameters and the radiation patterns plotted.
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