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Abstract
A wide-band microstrip circular patch antenna with two short circuiting pin loading is proposed for wireless communications. By using rigorous theory the dominant cavity modes of the patch are studied and it is found that the first four modes of the patch can act as good radiators. Numerical results show that by a proper choice of the pins and feed locations, one can achieve wide band operation with bandwidth as high as 45%. Design examples are presented as wideband patch antennas for wireless communications over the broad band 1.8–3.0 GHz.