Compact broadband modified triangular microstrip antennas

Slot cut compact shorted 60° sectoral microstrip antenna and its complementary configuration are proposed. The slot optimises the spacing between higher order TM1/4,1 and fundamental TM1/4,0 modes to yield broadband response. On air substrate of thickness 0.105λ 0, shorted 60° sectoral patch antenna yields a bandwidth (BW) (VSWR ≤ 2) of more than 600 MHz (821–1428 MHz, ∼54%), whereas its complementary configuration yields BW of more than 480 MHz (655–1142 MHz, >50%). The proposed antennas show a broadside radiation pattern with a gain of more than 3 dBi over the complete BW.