Compact shorted variations of triangular microstrip antennas

Equilateral and triangular 30 degrees-60 degrees-90 degrees microstrip antennas have been modified by shorting along the zero field to yield shorted 60 and 30 degrees-sectoral microstrip antennas, respectively. Experimental results on these antennas are presented. The shorted 60 and 30 degrees-sectoral antennas result in area reduction by factors of 2.5 and 5.0, respectively, compared to the equilateral triangular antenna with the same resonant frequency. The frequency is further reduced by partially shorting the curved edges of the sectoral antennas.