Fabrication & Characteristics of SIR Microsrip Bandpass Filters using Deposition of High-Tc Superconducting Epitaxial Films

고온 초전도 에피텍셜 박막을 이용한 SIR 마이크로스트립 대역통과 필터의 제작 및 특성연구

  • Park, Kyung-Kuk (Dept.of Electric Engineering, Chonbuk National University) ;
  • Chung, Dong-Chul (Dept.of Electric Engineering, Chonbuk National University) ;
  • Jeong, Yong-Chae (Department Info. & Comm. Engineering. Chonbuk National University) ;
  • Lim, Sung-Hun (Dept.of Electric Engineering, Chonbuk National University) ;
  • Yim, Seong-Woo (Dept.of Electric Engineering, Chonbuk National University) ;
  • Han, Byoung-Sung (Dept.of Electric Engineering, Chonbuk National University)
  • 박경국 (전북대학교 전기공학과) ;
  • 정동철 (전북대학교 전기공학과) ;
  • 정용채 (전북대학교 정보통신공학과) ;
  • 임성훈 (전북대학교 전기공학과) ;
  • 임성우 (전북대학교 전기공학과) ;
  • 한병성 (전북대학교 전기공학과, 공업연구실)
  • Published : 1999.05.01


In this paper, we designed and fabricated High-Tc Superconducting (HTS) microstrip bandpass filters using Stepped Impedance Resonators(SIR) and studied on their characteristics. The $high-T_c$ superconducting $Y_1Ba_2Cu_3O_{7-x}$ epitaxial films were deposited by Pulse Laser Deposition (PLD) system on MgO. The fabricated filters were designed so as to operate in Ku band with central frequency 17.25 GHz, bandwidth 2.896% and ripple 0.01 dB. These filters were composed of parallel coupled microstrip SIR of which impedance ratio (K) are 0.5, 1.5. In the measured response, HTS filters had showed insertion loss below -0.5 dB. For comparison with normal conducting filter, we fabricated the Au counterpart that consists of the resonators as K=1.5 in the same dimension and measured performance of the Au filter. In comparison, HTS filter designed optimally got superior response to gold conterpart.


HTS microstrip bandpass filter;Stepped Impedance Resonator(SIR);Epitaxial films;Impedance ratio(K);pulse Laser Deposition(PLD) system.


  1. IEEE Trans., Microwave Theory Tech. v.MTT-28 Bandpass filters using pararell coupled stripline stepped impedance resonators M. Makimoto;S. Yamashita
  2. IEEE Trans. Microwave theory Tech v.39 no.9 Low and high temperature superconducting microwave filters S. H. Talisa;M. A. Janocko;C. Moskowitz;J. Talvaccico;J. F. Billing;R. Brown;D. C. Buck;C. K. Jones;B. R. McAvoy;Wagner;D. H. Watt
  3. J. Phys. v.64 Possible high-Tc superconductivity in the Ba-La-Cu-O system J. G. Bednorz;K. A. Muller
  4. Microwave Journal High-Tc film development for electronic applications J. Talvacchio;G. R. Wagner;S. H. Talisa
  5. IEEE Trans. Microwave theory Tech v.39 YBCO superconducting ring resonator at millemeter-wavefrequency C. M. Chorey;K. Kong;K. B. Bhasin;J. D. Warner;T. Itoh
  6. IEEE Trans. Appl. Supercond. v.5 no.2 High-power high-temperature superconducting microstrip filters for cellular base-station application G. C. Liang;D. Zhang;C. F. Shih;M. E. Johansson;R. S. Withers
  7. Foundations for microstrip circuit design Terry Edwards
  8. Microwave filters, impedance-matching networks, and coupling structures G. L. Mattahaei;L. Young;E. M. T. Jones