一种毫米波全频段正交模耦合器研究  

Research on a Millimeter-wave Full-band Ortho-mode Transducer

作　　者：蒋姝 杨会军 葛仕奇[2] JIANG Shu;YANG Huijun;GE Shiqi(School of Information and Communication Engineering,Nanjing Institute of Technology,Nanjing 211167,China;Nanjing Research Institute of Electronics Technology,Nanjing 210039,China)

机构地区：[1]南京工程学院信息与通信工程学院,南京211167 [2]南京电子技术研究所,南京210039

出　　处：《微波学报》2024年第3期68-72,84,共6页Journal of Microwaves

基　　金：江苏省基础研究计划(自然科学基金)青年基金项目(BK20201046,BK20201038);江苏省高等学校基础科学(自然科学)研究项目(22KJB510023);南京工程学院引进人才科研启动基金项目(YKJ201973);南京工程学院教学改革与建设项目(JXJS2023022,JXGG2023025)。

摘　　要：为满足超宽带收发信机应用需求,提出了一种基于十字转门结构的改进型Ka全频段正交模耦合器。首先,为了提升宽带性能同时减小结构复杂度,设计了一种三阶E面弯波导以及一种阶梯型E面波导功分器,以实现对称的全E面结构设计。其次,提出了一种连接波导长度设计准则,保证了两种正交模式的相位一致性。该设计避免了切割十字转门结构,且剖分装配块的总数不超过四,大幅降低了加工容差、装配精度要求。实测结果表明,在26 GHz~40 GHz(42%)范围内,该正交模耦合器回波损耗优于20 dB,正交隔离度优于50 dB,插入损耗低于0.4 dB,两种模式传输路径相位差低于5°。实测性能与全波仿真结果具有良好的一致性。An improved Ka full-band ortho-mode transducer is proposed based on the turnstile junction for the ultra-wideband transceiver applications.To improve the performance of broadband and reduce the structure complexity,a three-step E-plane waveguide bend and a multi-step power combiner are designed to implement the entirely E-plane bend configuration.The length design criterion of the connecting waveguides is analyzed,which ensures that the electrical lengths of the two ortho-mode propagation paths are consistent.Benefiting from the entirely E-plane design,the structural symmetry is implemented and the turnstile junction can be machined in a complete block,requiring neither strict alignment nor a high level of mechanical tolerances.The number of the fabricated superimposed blocks is no more than four.The measured return loss and the isolation between the two orthogonal modes is 20 dB and 50 dB respectively,over 26 GHz~40 GHz(42%).The insertion loss of a single ortho-mode transducer is below 0.4 dB,and the phase difference between the two modes is below 5°.The results demonstrate a good agreement between the full-wave simulations and measurements.

关 键 词：Ka全频段 毫米波 十字转门 正交模耦合器 

分 类 号：TN622[电子电信—电路与系统]