The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Design of A Dual Band Branch Line Coupler Using a CRLH Transmission Line Structure

CRLH 전송선로 구조를 이용한 이중대역 브랜치 라인 커플러 설계

  • 박민우 (순천향대 전기통신공학과) ;
  • 구자경 (순천향대 전기통신공학과) ;
  • 임종식 (순천향대 전기통신공학과) ;
  • 정용채 (전북대 전자정보공학부) ;
  • 안달 (순천향대 전기통신공학과)
  • Published : 2009.12.01
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Abstract

This paper proposes a dual band branch line coupler (BLC) using a composite right/left handed (CRLH) transmission line. The existing dual band BLCs with open stubs require hundreds of line impedance for the open stub as the frequency bands approach to each other, so it has been almost impossible to realize them. However in the proposed BLC, a CRLH transmission line replaces the open stub with an extremely high line impedance so that the BLC circuit may be realized even two frequencies are close to each other. As an example, a dual band BLC operating at 1800MHz and 2300MHz (the frequency ratio is 1:1.28) is designed and measured. Open stubs with $560\Omega$ line impedance are replaced by CRLH transmission lines for realizing the dual band BLC. The measured performances prove that the dual band operation is well acceptable and the proposed design method is successful even the ratio between two frequencies is not around two nor more.

Keywords

References

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