A high power dual-band wideband planar inverted-F antenna

A high power dual-band wideband planar inverted-F antenna (PIFA) is designed. By embedding a L-shape branch-line split in the radiation patch of the planar inverted-F patch antenna, a novel operation of 274 MHz and 680 MHz dual-band is realized. To reduce the size of the structure and add the capacitive load, the resonator is curled under itself. The dual-band PIFA antenna has a percentage bandwidths of 14.6% and 20.1% in the low and high bands with S11 no more than -6 dB. Radiation efficiencies of up to 98% and 99% can be achieved at 274 MHz and 680 MHz, respectively. When the antenna is pressured in a nylon box with 0.2 MPa pressure, its wideband high power capability is more than 200 MW.