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The cavity model with magnetic side walls and dyadic Green's functions was used to study microstrip disc antennas. Curves of efficiency of space-wave launching and directivity as functions of the ratio of the dielectric thickness to the disc radius d/a are shown for two dielectrics: εr=2.55 and 9.60. The results are useful for the design of these antennas.
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Fonseca et al. (1982) studied this question.
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