A Compact Branch-line Directional Coupler Using Lumped-element CRLH TLs
In this paper,the design of a compact branch-line directional coupler using lumpedelement composite right/left-handed transmission line(CRLH TL)is presented.The compactness is achieved by replacing the-90° right-handed transmission lines(RH TL)in a conventional branch-line directional coupler with 90° CRLH TLs implemented using lumped elements.Computer simulation is used to study the performance of the coupler and results show that the coupler has a bandwidth from 0.96 to 0.99 GHz,with(/S11/)and(/S41/)lower than-15dB,(/S21/)and(/S31/)close to-3dB,and a phase difference of 90° between ports 2 and 3.For comparison,a conventional branch-line directional coupler implemented using the RH TL and working at the same center frequency is also designed.Simulation results show that the proposed coupler can achieve a size reduction of 82.8%compared with the conventional RH TL branch-line directional coupler.
Y.F.Wu J.Zhang S.W.Cheung
Department of Electrical and Electronic Engineering The University of Hong Kong,Hong Kong,China
国际会议
Progress in Electromagnetics Research Symposium 2013(2013年电磁学研究新进展学术研讨会)
台北
英文
1157-1161
2013-03-01（万方平台首次上网日期，不代表论文的发表时间）