The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Frequency Adjustable Dual Composite Right/Left Handed Transmission Lines

주파수 가변성을 갖는 D-CRLH 전송 선로

  • 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)
  • 임종식 (순천향대학교 전기통신공학과) ;
  • 구자정 (순천향대학교 전기통신공학과) ;
  • 한상민 (순천향대학교 전기통신공학과) ;
  • 정용채 (전북대학교 전자정보공학부) ;
  • 안달 (순천향대학교 전기통신공학과)
  • Published : 2008.12.31
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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.

종래 발표된 D-CRLH 전송 선로의 설계상의 어려움과 주파수가 불가변성 문제를 해결하기 위하여 본 논문은 주파수 가변성이 있는 D-CRLH 전송 선로 구조 두 가지를 제안한다. 첫째 구조(type 1)는 DGS와 DGS 내의 아일랜드 패턴(island pattern)에 버랙터 다이오드를 연결하여 병렬 공진 회로 내의 $C_L$을 조절할 수 있고, 둘째 구조(type 2)는 스터브에 다이오드를 연결하여 직렬 공진 회로 내의 $C_R$을 조절한다. 바이어스 조절에 따라 RH/LH 대역에서 각각 +/-90도의 유의미한 전기적 길이를 갖는 이중 대역 주파수가 가변된다. $1{\sim}12\;V$의 바이어스 전압에 대하여 측정한 결과, LH 영역에서 -90도인 전기적 길이를 갖는 주파수가 type 1과 type 2에서 각각 $4.22{\sim}5.39\;GHz$와 $4.21{\sim}5.05\;GHz$이다. 또한, type 2의 경우에 RH에서 LH 영역으로 전환하는 주파수(${\omega}_{\infty}$)가 $3.26{\sim}4.22\;GHz$의 가변 영역을 갖는다.

Keywords

References

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