Trans-directional coupler with adjustable coupling coefficients and reconfigurable responses

被引:11
作者
Liu, Hongmei [1 ]
Fang, Shaojun [1 ]
Wang, Zhongbao [1 ,2 ]
机构
[1] Dalian Maritime Univ, Sch Informat Sci & Technol, Dalian 116026, Liaoning, Peoples R China
[2] Beijing Univ Posts & Telecommun, Sch Elect Engn, Beijing 100876, Peoples R China
基金
中国国家自然科学基金;
关键词
directional couplers; transdirectional coupler; adjustable coupling coefficients; reconfigurable responses; compensation capacitor; varactor; closed-form design equations; even-odd mode method; HYBRID COUPLER; LUMPED-ELEMENT;
D O I
10.1049/iet-map.2016.0877
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The study presents the theoretical and experimental study of a trans-directional coupler with adjustable coupling coefficient and reconfigurable responses. The proposed coupler is composed of coupled lines, capacitors, varactor and inductors. By connecting different inductors through switches for the circuit implementation, and using varactor as compensation capacitor, the coupling coefficient of the proposed coupler can be easily controlled. It also features balanced output ports power distribution, high isolation, good return loss, and consistent output ports phase difference. In addition, when no inductors connected, the proposed coupler is reconfigured to be a crossover. Closed-form design equations are derived by utilising the even-odd mode method. Based on these analytical equations, an experimental prototype is designed, fabricated and characterised. The measured results show that the coupling coefficient of the coupler can be adjusted from -3 to -40dB with good isolation and return loss performances.
引用
收藏
页码:1340 / 1346
页数:7
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