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| Discussion on coupling mechanism of asymmetric CRLH/RH TL coupler |
| Wang You-zhen, Zhang Ye-wen, He Li, Liu Fu-qiang, Li Hong-qiang, Chen Hong |
| School of Electronics and Information, Tongji University, Shanghai 200092, China; Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, China |
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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.
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Received: 02 November 2005
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