The variations in the sizes and position of a parasitic element with the input impedance and bandwidth of a rectangular microstrip antenna are investigated by the method of moments. An integral equation for the unknown patch current densities is formulated in the spectral domain. The Galerkin procedure is employed to solve for the unknowns. It is found that the input impedance varies significantly with the size and position of the parasitic patch. The result is important for bandwidth enhancement and impedance matching of the microstrip antenna.>
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Au et al. (1991) studied this question.
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