设计了一种双频带的高功率宽谱平面倒F天线。在矩形贴片上开L形槽实现天线双频辐射。采用圆锥过渡实现同轴馈线到平板之间的宽带阻抗匹配；通过折叠振子电容加载和合理增加天线高度和宽度实现天线宽带设计。经过优化设计，实现了274 MHz和680 MHz的双频输出，反射系数S11不超过-6 dB的低频带宽和高频带宽分别达到14.6%和20.1%。天线的低频和高频增益分别达到4.4 dB和4.6 dB，对应辐射效率分别达到98%和99%。主辐射方向上的低频和高频远场辐射场与距离乘积与馈入宽带脉冲幅度比值分别为1.07和1.14。对天线的高功率容量进行了设计，将天线置于充0.2 MPa压力SF6气体的增强尼龙箱体中，天线可承受200 MW宽谱高功率微波。

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.