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Abstract
—The cavity modes of a circular microstrip patch antenna are derived in the presence of a shorting post. The modal equation is solved for the modal resonant frequencies and the modal radiation fields and power are obtained. It is confirmed that, for a given operating frequency, a considerable reduction of patch size is achieved by the dominant mode depending on the post location and post size. Good comparison with published experimental data is demonstrated. It is shown, however, that the size reduction provided by the post-loaded patch is obtained at the expense of a reduction in radiation efficiency relative to what can be achieved by an unloaded patch.