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CLC number: TN62

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Received: 2005-11-02

Revision Accepted: 2005-11-21

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Journal of Zhejiang University SCIENCE A 2006 Vol.7 No.1 P.95~98

http://doi.org/10.1631/jzus.2006.A0095


Discussion on coupling mechanism of asymmetric CRLH/RH TL coupler


Author(s):  Wang You-zhen, Zhang Ye-wen, He Li, Liu Fu-qiang, Li Hong-qiang, Chen Hong

Affiliation(s):  School of Electronics and Information, Tongji University, Shanghai 200092, China; more

Corresponding email(s):   yewenzhang@online.sh.cn

Key Words:  Asymmetric coupler, Coupling mechanism, Composite right-/left-handed transmission line (CRLH TL)


Wang You-zhen, Zhang Ye-wen, He Li, Liu Fu-qiang, Li Hong-qiang, Chen Hong. Discussion on coupling mechanism of asymmetric CRLH/RH TL coupler[J]. Journal of Zhejiang University Science A, 2006, 7(1): 95~98.

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author="Wang You-zhen, Zhang Ye-wen, He Li, Liu Fu-qiang, Li Hong-qiang, Chen Hong",
journal="Journal of Zhejiang University Science A",
volume="7",
number="1",
pages="95~98",
year="2006",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2006.A0095"
}

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%T Discussion on coupling mechanism of asymmetric CRLH/RH TL coupler
%A Wang You-zhen
%A Zhang Ye-wen
%A He Li
%A Liu Fu-qiang
%A Li Hong-qiang
%A Chen Hong
%J Journal of Zhejiang University SCIENCE A
%V 7
%N 1
%P 95~98
%@ 1673-565X
%D 2006
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2006.A0095

TY - JOUR
T1 - Discussion on coupling mechanism of asymmetric CRLH/RH TL coupler
A1 - Wang You-zhen
A1 - Zhang Ye-wen
A1 - He Li
A1 - Liu Fu-qiang
A1 - Li Hong-qiang
A1 - Chen Hong
J0 - Journal of Zhejiang University Science A
VL - 7
IS - 1
SP - 95
EP - 98
%@ 1673-565X
Y1 - 2006
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2006.A0095


Abstract: 
A quasi 0-dB coupler composed of a composite right-/left-handed transmission line (CRLH TL) and a conventional right-handed transmission line (RH TL) is presented. This coupler is shown to exhibit broad bandwidth and tight coupling characteristics. The circuit model and S-parameter results are also demonstrated. Another coupler with properly chosen loaded lumped-elements LL and CL in the CRLH TL is proposed to gain further understanding of the coupling mechanism. By adjusting the spacing between the CRLH TL and RH TL from 8 mm to 0.2 mm, it can be shown that backward coupling occurs in the left-handed region.

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

Reference

[1] Caloz, C., Itoh, T., 2004. A novel mixed conventional microstrip and composite right/left-handed backward-wave directional coupler with broadband and tight coupling characteristics. IEEE Micro. Wireless Comp. Lett., 14(1):31-33.

[2] Caloz, C., Sanada, A., Itoh, T., 2004. A novel composite right/left-handed coupled-line directional coupler with arbitrary coupling level and broad bandwidth. IEEE Trans. Micro. Theo. Tech., 52:980-992.

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

[4] Shadrivov, I.V., Sukhorukov, A.A., Kivshar, Y.S., 2003. Guided modes in negative-refractive-index waveguides. Phys. Rev. E, 67:057602.

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

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

[7] Zhang, D.K., Zhang, Y.W., He, L., Li, H.Q., Liu, F.Q., Chen, H., 2004. Codirectional coupler and power divider mixed microstrip and metamaterials with lumped-elements L-C. ICMMT, p.304-307.

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