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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Tunable Bandstop Filter with Combined Right/Left-Handed Transmission Lines

Right/Left-Handed 전송 선로를 결합한 가변 대역 저지 필터

  • Sung, Gyu-Je (Dept. of EE, Hankyong National University) ;
  • Kim, Ell-Kou (School of Electronics Engineering, Kumoh National Institute of Technology) ;
  • Kim, Young (School of Electronics Engineering, Kumoh National Institute of Technology) ;
  • Yoon, Young-Chul (Electronics and Information Communication Engineering, Kwandong University)
  • 성규제 (한경대학교 전자공학과) ;
  • 김일규 (금오공과대학교 전자공학부) ;
  • 김영 (금오공과대학교 전자공학부) ;
  • 윤영철 (관동대학교 전자정보통신부)
  • Published : 2008.10.31
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Abstract

A novel tunable bandstop filter was proposed. It is composed of a right-handed transmission line, which has lowpass characteristics, and a left-handed transmission line which has highpass characteristics. Dispersion relations for the unit cells of RHTL and LHTL were derived by the method of ABCD parameter analysis. Varactor diodes and chip inductors were used to make the unit cells of RHTL and LHTL. A tunable bandstop filter was designed and fabricated by the parallel connection of RHTL and LHTL. The measured results of the proposed tunable bandstop filter are agreed well with the simulated results.

본 연구에서는 Right-handed 전송 선로(RHTL)의 저역 통과 특성과 Left-handed 전송 선로(LHTL)의 고역 통과 특성을 결합한 구조의 가변 대역 저지 필터를 제안하였다. RHTL, LHTL의 분산 특성을 ABCD 행렬을 통해 구하고 차단 주파수를 계산하였다. 바렉터 다이오드와 칩 인덕터를 이용하여 RHTL,LHTL 단위 셀을 구성하고 각각 4개의 단위 셀이 연결된 RHTL, LHTL을 병렬로 연결하여 가변 대역 저지 특성을 구현하였다 제작된 가변 대역 저지 필터는 저역 차단 주파수 $280{\sim}395$ MHz, 고역 차단 주파수 $770{\sim}940$ MHz의 가변 특성을 갖는다.

Keywords

References

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