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CLC number: O441

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Received: 2005-04-27

Revision Accepted: 2005-05-08

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Journal of Zhejiang University SCIENCE A 2005 Vol.6 No.6 P.483~486

http://doi.org/10.1631/jzus.2005.A0483


A tunable dual-broad-band branch-line coupler utilizing composite right/left-handed transmission lines


Author(s):  ZHANG Yu, HU Li, HE Sai-ling

Affiliation(s):  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; more

Corresponding email(s):   zhangyu@coer.zju.edu.cn, sailing@ieee.org

Key Words:  Branch-line coupler (BLC), Broad band, Dual-band, Composite right/left-handed (CRLH), Left-handed, Tunable


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ZHANG Yu, HU Li, HE Sai-ling. A tunable dual-broad-band branch-line coupler utilizing composite right/left-handed transmission lines[J]. Journal of Zhejiang University Science A, 2005, 6(6): 483~486.

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author="ZHANG Yu, HU Li, HE Sai-ling",
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doi="10.1631/jzus.2005.A0483"
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%A HE Sai-ling
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T1 - A tunable dual-broad-band branch-line coupler utilizing composite right/left-handed transmission lines
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A1 - HE Sai-ling
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Abstract: 
A tunable dual-broad-band branch-line coupler (BLC) utilizing left-handed (CRLH)%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>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 pass band is more than 16% of the central frequency.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1] Ashforth, J.V., 1988. Design equations to realize a broadband hybrid ring or a two-branch guide coupler of any coupling coefficient. Electron. Lett., 24(20):1276-1277.

[2] Collin, R.E., 1966. Foundations of Microwave Engineering. McGraw-Hill.

[3] Islam, R., Eleftheriades, G.V., 2003. A planar metamaterial co-directional coupler that couples power backward. IEEE MTT-S Dig., 1:321-324.

[4] Iyer, A.K., Eleftheriades, G.V., 2002. Negative refractive index metamaterials supporting 2-D waves. IEEE MIT-S Dig., 2:1067-1070.

[5] Lin, I., DeVincentis, M., Caloz, C., Itoh, T., 2004. Arbitrary dual-band components using composite right/left-handed transmission lines. IEEE Trans. Microwave Theory Tech., 52:1142-1149.

[6] Liu, L., Caloz, C., Itoh, T., 2000. Dominant mode (DM) leaky-wave antenna with backfire-to-endfire scanning capability. Electron. Lett., 38(23):1414-1416.

[7] Shelby, R., Smith, D., Schultz, S., 2001. Experimental verification of a negative index of refraction. Science, 292:77-79.

[8] Veselago, V.G., 1968. The electrodynamics of substances with simultaneously negative values of ε and μ. Soviet Phys. Usp., 10(4):509-514.

Open peer comments: Debate/Discuss/Question/Opinion

<1>

zhxh@nwpu<zhxhwinnie@163.com>

2010-11-19 19:45:18

maybe it is a good design.

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