现有的小耦合量漏波天线设计方法不能直接应用到低频大耦合量漏波天线的设计。对于大耦合量漏波天线的设计，利用CST建立仿真模型，提取大耦合量漏波结构的电参数，并对相关物理参数进行理论分析，在此基础上，设计L波段高功率微波漏波波导天线。天线长度约 2.20 m，仿真所得增益达到15.8 dBi，功率容量为1.6 GW，E平面波束宽度104°，具有一定的波束扫描能力。仿真所得结果与理论预期相符，证明该设计方法可行。

The design method utilized to small coupling Leaky-Waveguide Antenna(LWA) cannot be applied directly to the large coupling LWA. CST is adopted to extract the leaky-wave structure’s electrical parameters for designing a leaky-waveguide antenna with large coupling, and the design principle and the related physical parameters acquisition method of the high power rectangular LWA are theoretically analyzed. A 2.20 m high power rectangular LWA working in L band is designed and simulated by CST software, the results show that the gain of the antenna is 15.8 dBi and the main lobe direction is matched well with the theory. Moreover, the power handling capacity is about 1.6 GW, which provides a good choice for high power microwave application.