介绍了一种S波段25 dB大功率微带定向耦合器的设计方法及测试结果。为了对大功率微波信号进行较为准确的 检测,微带耦合器需具有抗大功率串扰强、带内平坦度好、插损小的性能。文中采用电感补偿平衡奇偶模相速技术,由二 元概念和容性补偿奇偶模相速的理论,分析出电感补偿电路的设计参数,用Ansoft HFSS 软件进行仿真与优化,实现了高 性能大功率微带定向耦合器。微带电路加工在Rogers RT/ duroid 6002基片上,分别用10 W和300 W固态发射机对其抗 大功率串扰的性能进行了测试。经实测数据分析,所设计的耦合器在工作频带内,插损小于0.3 dB,带内波动低于1 dB, 方向性大于9 dB。

An implementation scheme and test results of 25 dB high power microstrip directional coupler is proposed. In order to test high power microwave signal accurately, microstrip coupler should have strong anti-cross interfere capability,good band flatness,low insertion loss. In this paper, compensation techniques of inductor are adopted to poise the odd mode and even mode. Design parameters are obtained by binary concept and capacitive compensation theory. The simulation and optimization are completed by soft using Ansoft HFSS. High performance and high power microstrip directional coupler is implemented. Microstrip circuit is made by substrate using Rogers RT/ duroid 6002. Solid state transmitter of 10 W and 300 W are used to test anti-cross interfere capability. The results show that, within the operating frequency range, the insertion loss is less than 0.3 dB, and the ripple level of the coupling factor better than 1 dB, and the directivity more than 9 dB.