A novel composite right-/left-handed coupled-line directional coupler with arbitrary coupling level and broad bandwidth

被引：402

作者：

Caloz, C ^{[1
]}

Sanada, A

Itoh, T

机构：

[1] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA

[2] Yamaguchi Univ, Fac Engn, Yamaguchi, Japan

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2004年 / 52卷 / 03期

关键词：

composite right-/left-handed (CRLH) transmission; lines (TLs); coupled lines; directional couplers;

D O I：

10.1109/TMTT.2004.823579

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

xA novel composite right-/left-handed (CRLH) backward-wave coupled-line directional coupler with arbitrary coupling level and broad bandwidth is presented, explained by even/odd-mode analysis, validated by full-wave simulations, and demonstrated by experiments. First, the CRLH-transmission-line (CRLH TL) theory is given, and a microstrip implementation of a CRLH TL is described. A simple circuit model is then proposed both for the understanding and design of the coupler. The coupler exhibits very unusual characteristics, such as zero electrical length, imaginary even/odd-mode characteristic impedances, and coupling dependence on even/odd attenuation length (instead of propagation length). Both a quasi-0- and 3-dB coupler are demonstrated experimentally. The 3-dB coupler exhibits amplitude balance of +/-2 dB over a huge bandwidth of 50% (3.5 +/- 5.8 GHz), phase balance of 90degrees +/- 5degrees from 3.0 to 4.0 GHz and directivity of 20 dB.

引用

页码：980 / 992

页数：13

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