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.