New Compact and Broadband Patch Antenna Configurationsfor Wireless Applications

− We present new compact patch antenna configurations with broadband capabilities for wireless applications. Analytical, simulation, and experimental work is performed on semi-circular and quarter-circular patch antennas with a shorting pin. The resonant frequencies and radiation fields of the dominant cavity modes of the shorted patch are derived. For the shorted semi-circular patch, the broadband operation is based on the efficient excitation of two staggered modes of the patch. It is shown that a relative bandwidth of 58% is achieved with a patch area that is only 13.6% of the central wavelength squared. The shorted quarter circular patch with the same radius as the half circular one provides a relative bandwidth of about 30%.