INDEPENDENTLY-TUNED CONCURRENT DUAL-BAND BRANCH-LINE COUPLER USING VARACTOR  

作　　者：Guo Xiaofeng Ye Yan Liu Taijun Xu Qian Li Ruiyang 

机构地区：[1]College of Information Science and Engineering,Ningbo University

出　　处：《Journal of Electronics(China)》2014年第4期348-353,共6页电子科学学刊（英文版）

基　　金：Supported by the Provincial Natural Science Foundation of Zhejiang(No.Y1101270);the National Natural Science Foundation of China(No.61171040);Ningbo University Disciplinary Project(No.XKL141038);Agilent Technologies Inc.Research Project(No.3110)

摘　　要：This paper presents a concurrent dual-band branch-line coupler with an independently tunable center frequency. In the proposed architecture, the quarter-wavelength lines, which work at two separated bands concurrently and can be tuned in one of them, are key components. Based on the analysis of ABCD-matrix, a novel hybrid structure and a pair of varactors topology are utilized to achieve concurrent dual-band operation and independent tunability, respectively. Using this configuration, it is convenient to tune the center frequency of the upper band, while the responses of the lower band remain unaltered. To verify the proposed idea, a demonstration is implemented and the simulated results are presented.This paper presents a concurrent dual-band branch-line coupler with an independently tunable center frequency.In the proposed architecture,the quarter-wavelength lines,which work at two separated bands concurrently and can be tuned in one of them,are key components.Based on the analysis of ABCD-matrix,a novel hybrid structure and a pair of varactors topology are utilized to achieve concurrent dual-band operation and independent tunability,respectively.Using this configuration,it is convenient to tune the center frequency of the upper band,while the responses of the lower band remain unaltered.To verify the proposed idea,a demonstration is implemented and the simulated results are presented.

关 键 词：Branch-line coupler Concurrent dual-band VARACTOR Independently tuned Quarter-wavelength lineCLC number：TN92 

分 类 号：TN92[电子电信—通信与信息系统]