A Tunable Dual-Broad-band Branch-Line Coupler Utilizing Composite Right/left-Handed Transmission Lines
springer(2005)
摘要
A tunable dual-broad-band branch-line coupler (BLC) utilizing composite right/left-handed (CRLH) transmission lines is presented. Two λ/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 passband is more than, 16% of the central frequency.
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关键词
Branch-line coupler (BLC),Broad band,Dual-band,Composite right/left-handed (CRLH),Left-handed,Tunable,O441
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