In this paper, we present an analysis of the radiation properties of rectangular patch antennas with inhomogeneous substrates via a combined spectral-domain formulation based on the Method of Moments (MoM). Some numerical results (radiation patterns, cross-polarization levels, radiation efficiencies and bandwidth) are also presented and compared with those obtained using homogeneous substrates, showing the inhomogeneity effects.
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Bilotti et al. (2002) studied this question.
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