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An analysis of a microstrip antenna over a finite ground plane is carried out. This analysis is done with one disk patch over another, in which the bottom patch serves as a ground plane. The resulting Green's function for a patch in the Fourier domain is presented and the surface current density is calculated using the method of moments technique, with the inclusion of an attachment current mode and entire domain edge mode expansion functions to properly model the current in the vicinity of the probe–disk junction and to accelerate the convergence of the moment method solution. Finally, the radiation patterns and the ratio between the power above and below the ground plane are shown as a function of the ratio between the patch area and the ground area.
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Bauer et al. (1995) studied this question.
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