Ka频段3 dB定向耦合器设计
Design on 3 dB Directional Coupler Operating on Ka Band

本文介绍了一种ka频段3 dB定向耦合器的设计方法。在微带环形电桥理论分析的基础上，实现了Ka频段带状线环形电桥的设计，通过波导–带状线过渡的设计，定向耦合器的所有端口为BJ400波导。仿真设计结果表明，在34~37 GHz范围内，定向耦合器所有端口电压驻波比优于1.2，输出端口的传输系数均优于？3.2 dB，隔离度大于30 dB，设计性能达到了预期设计目标。
A design method for Ka band 3 dB directional coupler is proposed in this paper. Based on the analysis of the theoretical micro-strip hybrid ring, the design of Ka strip line hybrid ring is realized. Through the design of waveguide-strip line transition, all ports of the directional coupler are BJ400 standard waveguides. The simulation results show that in the range of 34~37 GHz, the VSWR of all ports is better than 1.2, the transmission coefficient of the output port is better than ？3.2 dB, and the isolation degree is greater than 30 dB. The design performance of the directional coupler reaches the expected design goal.