基于可开关桥式耦合结构的介质滤波开关  

Dielectric filtering switch based on switchable bridge-type coupling structures

作　　者：张朋飞 刘疆 秦伟[1] 陈建新[1] ZHANG Pengfei;LIU Jiang;QIN Wei;CHEN Jianxin(School of Information Science Technology,Nantong University,Nantong 226019,China)

机构地区：[1]南通大学信息科学技术学院,南通226019

出　　处：《电波科学学报》2022年第1期87-92,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金(61971244);江苏高校‘青蓝工程’。

摘　　要：作为无线通信时分双工子系统的重要元件之一,目前绝大多数已报道的滤波开关是利用微带线结构实现的,然而其较高的损耗已逐渐不能满足通信系统的要求.文中针对介质滤波器提出了一种可开关桥式耦合结构,该耦合结构由印刷电路板上的一部分金属带条和伸入介质腔体内部的两根金属探针构成.将PIN管并联在金属带条上,通过控制PIN管的偏置电压从而实现对耦合路径的开和关.为验证所提出结构的开关性能,本文设计、加工并测试了一款适用于5G应用的四阶介质滤波开关.测试结果表明,该设计在打开状态下的插入损耗只有1.2 dB,在关闭状态下的隔离度达到了50 dB.与传统微带滤波开关相比,本设计具有更低的插入损耗和更高的隔离度.As one of the important components in the time division duplex(TDD) subsystem of wireless communications, filtering switch, which integrates two functions of filter and switch, has been widely concerned and studied. At present, most of the reported filtering switches are realized by microstrip lines. However, the loss of microstrip filtering switch cannot meet the requirements of the communication systems. A switchable bridge-type coupling structures for dielectric filters is presented in this paper. The coupling structure is constructed by a section of metal strip on the printed circuit board(PCB) and two metal probes inserted in the adjacent dielectric cavities. Shunt PIN diodes are loaded at the metal strips so that the coupling path can be switched on or off by controlling the bias conditions of the PIN diodes. For demonstration, a fourth-order dielectric filtering switch is implemented and measured for 5 G applications. It features an on-state low loss of 1.2 dB and an off-state isolation of 50 dB in measurement. The proposed design features lower insertion loss and higher isolation as compared with the traditional microstrip filtering switches.

关 键 词：可开关耦合 介质 滤波开关 低损耗 高隔离度 

分 类 号：TN622[电子电信—电路与系统]