Abstract

A theoretical comparison between the surface wave (SW) efficiency of probe-fed and aperture-coupled rectangular patch antennas is presented. In both cases the analysis is based on a full-wave formulation. The SW efficiencies of the two patches were found to be almost the same. The SW efficiency is a function of the substrate thickness and dielectric constant as well as the current distribution of the antenna. Since the current distributions for both geometries are very similar, the SW efficiencies are almost identical. As long as the resonant frequency of the slot is above that of the patch (to avoid losses due the slot radiation), it should be safe to assume that the overall efficiencies of the two geometries are very similar. The efficiency of the aperture-coupled patch is only slightly smaller due to SW excitation by the microstrip feed line. >

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