一种用于卫星通信的高隔离全带宽线极化双工器  

A High Isolation Full-Bandwidth Linear Polarized Diplexer for Satellite Communication

作　　者：刘颖巧 蒋然 尤阳 尤清春 陆云龙[1] LIU Ying-qiao;JIANG Ran;YOU Yang;YOU Qing-chun;LU Yun-long(Wireless Research Institute,School of Information Science and Engineering,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学信息科学与工程学院无线研究院,宁波315211

出　　处：《微波学报》2023年第4期57-61,共5页Journal of Microwaves

基　　金：国家重点研发计划(2018YFB1802100);国家自然科学基金(61801252,U1809203,61631012,61774098);广东省重点领域研发计划(2019B010156004);浙江省省属高校基本科研业务费专项资金(SJLY2020001)。

摘　　要：文中设计了一种Ku频段新型全金属高隔离度线极化双工器,它由一个正交模耦合器(Ortho-mode Transducer,OMT)和两个不同频段的滤波器组成。OMT采用非对称无隔膜形式,在保持结构紧凑的同时实现了全带宽通信,具有优异的线极化特性。为抑制带外信号,提高双工器端口隔离度,上行链路通道采用了结构紧凑、损耗小的消失模带通滤波器,下行链路通道采用结构简单的阶梯阻抗低通滤波器。测试结果表明,线极化双工器覆盖了卫星通信上下行链路的全部带宽(上行:13.75~14.5 GHz,下行:10.7~12.75 GHz),在工作频段范围内反射系数小于-15 dB,端口隔离度优于85 dB。A novel Ku-band all-metal high-isolation waveguide linearly-polarized diplexer is designed in this paper.The diplexer consists of an ortho-mode transducer (OMT) and two different frequency filters.The OMT adopts the form of asymmetric non-diaphragm and has excellent linear polarization characteristics.The structure enables full bandwidth communication while keeping the structure compact.In order to suppress the out-of-band signal and improve the port isolation,the uplink channel adopts an evanescent-mode band-pass filter,and the downlink channel adopts a stepped-impedance low-pass filter.The test results show that the linear polarized diplexer can cover the entire bandwidth of Ku-band satellite communication (uplink:13.75-14.5 GHz,downlink:10.7-12.75 GHz),the reflection coefficient is less than-15 dB in the working frequency range,and the port isolation is better than 85 dB.

关 键 词：高隔离度 全带宽 正交模耦合器 消失模滤波器 阶梯阻抗滤波器 

分 类 号：TN927.2[电子电信—通信与信息系统] TN631.2[电子电信—信息与通信工程]