Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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A Design of High Temperature Superconducting Low-Pass Filter for Broad-Band Harmonic Rejection

광대역 고조파 제거용 고온초전도 저역통과 필터의 설계

  • Kwak, Min-Hwan (Department of Electrical Eng. Gyeongsang National Univ.) ;
  • Kim, Sang-Hyun (Department of Electrical Eng. Gyeongsang National Univ.) ;
  • Ahn, Dal (Dept of Electronics, Soonchunhyang Univ.) ;
  • Han, Seok-Kil (Electronics and Telecommunication Research and Institute) ;
  • Kang, Kwang-Yong (Electronics and Telecommunication Research and Institute)
  • 곽민환 (경상대학교 공과대학 전기공학과) ;
  • 김상현 (경상대학교 공과대학 전기공학과) ;
  • 안달 (순천향대학교 전자공학과) ;
  • 한석길 (한국전자통신연구원) ;
  • 강광용 (한국전자통신연구원)
  • Published : 2000.05.13
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Abstract

A new type low-pass filter design method based on a coupled line and transmission line theory is proposed to suppress harmonics by attenuation poles in the stop band The design formula are derived using the equivalent circuit of a coupled transmission line. The new low-pass filter structure is shown to have attractive properties such as compact size, wide stop band range and low insertion loss. The seventh-order low-pass filter designed by present method Ins a cutoff frequency of 0.9 GHz with a 0.01 dB ripple level. The coupled line type low-pass filter with stripline configuration was fabricated by using a high-temperature superconducting (HTS ; $YBa_2Cu_3O_{7-x}$) thin film on MgO(100) substrate. Since the HTS coupled line type low-pass filter was proposed with five attenuation poles in stop band such as 1.8, 2.5, 4, 5.5, 62 GHz. The fabricated low-pass filter has improved the attenuation characteristics up to seven times of the cutoff frequency Bemuse of good rejection of the spurious signals and harmonics, our low-pass filter is applicable to mobile base station systems such as cellular, personal communication systems and international mobile telecommunication(IMT)-2000 systems.

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