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http://dx.doi.org/10.5515/KJKIEES.2008.19.12.1375

Frequency Adjustable Dual Composite Right/Left Handed Transmission Lines  

Lim, Jong-Sik (Department of Electrical and Communication Engineering, Soonchunhyung University)
Koo, Ja-Kyung (Department of Electrical and Communication Engineering, Soonchunhyung University)
Han, Sang-Min (Department of Electrical and Communication Engineering, Soonchunhyung University)
Jeong, Yong-Chae (Department of Electronic and Information Engineering, Chonbuk National University)
Ahn, Dal (Department of Electrical and Communication Engineering, Soonchunhyung University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.19, no.12, 2008 , pp. 1375-1382 More about this Journal
Abstract
Frequency adjustable D-CRLH(dual-composite right/left handed) transmission lines, which solve the problem of design complexity and uncontrolled frequency of the existing structures, are proposed in this paper. The first design(type I), consisting of defected ground structure(DGS), island pattern in DGS, fixed stub and varactor diodes, controls $C_L$ in the parallel resonant circuit, while the second structure(type 2) composed of fixed DGS, shunt stub and diode adjusts $C_R$ in the series resonant circuit. The dual band frequency points which correspond to the meaningful electrical length of +/-90 degree in the RH/LH region are adjustable according to the bias voltage. The measurement shows that the LH frequency point which has -90 degree of electrical length are adjusted over $4.22{\sim}5.39\;GHz$ and $4.21{\sim}5.05\;GHz$ for type 1 and type 2, respectively, under $1{\sim}12\;V$ of bias voltage. In addition, the frequency Woo where RH turns over LH is controled over $3.26{\sim}4.22\;GHz$ for type 2 with the same bias condition.
Keywords
CRLH; DCRLH; Defected Ground Structure;
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