基于小孔耦合的毫米波宽带定向耦合器研究

基于小孔耦合理论和电磁场全波分析法,根据正向叠加和反向抵消原则,确定耦合孔半径、间距和数量,并通过HFSS 软件进行仿真设计,实现了毫米波段定向耦合器的工作频段展宽;提出了一种新颖的波导腔体三层结构设计方案,解决了波导接触面缝隙切割电流引起的毫米波辐射问题,实现了波导无辐射装配,提高了器件的稳定性和可靠性。成功研制的毫米波W 波段宽带、高耦合度定向耦合器在88 ~102 GHz 频段传输损耗0.6 dB,两路输出幅度误差优于±0.3 dB,隔离度大于18 dB。

Research on Millimeter-Wave Wideband Directional Coupler Based on Aperture Coupling

Based on the analysis of aperture coupling and full-wave method of electromagnetic, a wideband directional coupler with high coupling coefficient in Millimeter-wave is successful developed in this paper. According to the principle of adding forward and reducing backward, the radius, distance and number of the aperture is identified, which has been verified by simulation result in HFSS. A novel three layer waveguide structure is proposed in this paper. In this way, radiation problem caused by cutting current at the split interface is solved, and the stability and reliability of the device are improved. Test result indicates that, insertion loss of the millimeter-wave 3 dB directional coupler is 0.6 dB in the frequency range of 88 ~102 GHz, with amplitude difference less than ±0.3 dB and isolation better than 18 dB.