Broadband Sectoral Slot Cut Microstrip Antenna

The broadband microstrip antenna is more commonly realized by cutting the slot at an appropriate position inside the patch. The slot is said to introduce a mode near the resonance frequency of the fundamental mode of the patch and yields broadband response. The compact microstrip antenna is realized by placing the shorting post or the plate along the zero field line at the fundamental mode of the patch. In this paper, the compact variation of equilateral triangular microstrip antenna, a shorted sectoral microstrip antenna is discussed. A broadband proximity fed rectangular slot cut shorted sectoral microstrip antenna is proposed. The analysis to study the effects of slot on the broadband response is presented. The slot reduces the higher order mode resonance frequencies of the shorted sectoral patch and along with the fundamental patch mode yields broadband response. The simulated and measured bandwidth of more than 550 MHz is realized. Since the shorted patch is used, the antenna shows radiation pattern in end-fire direction with a gain of more than 6 dBi over the bandwidth.