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The design and experimental results of a wideband Π-shaped aperture-coupled U-slot patch antenna are presented. The impedance bandwidth of the antenna is about 27%, centered at 12.5 GHz. The average gain and cross polarization of the antenna are about 7 dBi and −20 dB, respectively. Both the gain and radiation patterns were measured, and were found to be stable across the passband.
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Tong et al. (2000) studied this question.
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