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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2005, Vol. 6 Issue ( 6): 1-    DOI: 10.1631/jzus.2005.A0483
    
A tunable dual-broad-band branch-line coupler utilizing composite right/left-handed transmission lines
ZHANG Yu, HU Li, HE Sai-ling
Centre for Optical and Electromagnetic Research, Joint Research Centre of Photonics of the Royal Institute of Technology(Sweden) and Zhejiang University, Zhejiang University, Hangzhou 310027, China; Division of Electromagnetic Theory, Alfven Laboratory, Royal Institute of Technology, S-100 44, Stockholm, Sweden
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Abstract  A tunable dual-broad-band branch-line coupler (BLC) utilizing composite right/left-handed (CRLH) transmission lines is presented. Two |?/4 segments consisting of CRLH transmission lines are added to each port to broaden the dual bands of the branch-line coupler. Numerical simulation and optimal design of the novel coupler are presented. The dual bands of the novel coupler are tunable and broad. The 1-dB bandwidth of each pass band is more than 16% of the central frequency.

Key words： Optical and Electromagnetic Branch-line coupler (BLC)      Broad band      Dual-band      Composite right/left-handed (CRLH)      Left-handed      Tunable     
Received: 27 April 2005     
CLC:  O441  
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ZHANG Yu
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Cite this article:

ZHANG Yu, HU Li, HE Sai-ling. A tunable dual-broad-band branch-line coupler utilizing composite right/left-handed transmission lines. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2005, 6( 6): 1-.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2005.A0483     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2005/V6/I 6/1

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