An Analysis in Optimum Coupling Method of Cylindrical Dielectric Resonator Filter Designed by Non-decaying Mode Analysis

Non-decaying 모드 해석을 이용해서 설계한 원통형 유전체 공진기 여파기의 최적 결합 방법에 대한 분석

  • Lee, Won-Hui (Dept. of Electronics, Information & Communication Eng., Konkuk University) ;
  • Park, Chang-Won ;
  • Kim, Tai-Shin (Dept. of Electronics, Information & Communication Eng., Konkuk University) ;
  • Hur, Jung (Dept. of Electronics, Information & Communication Eng., Konkuk University) ;
  • Lee, Sang-Young (Dept. of Physics, Konkuk University)
  • 이원희 (건국대학교 전자.정보통신공학과) ;
  • 박장원 (해리컴(주)) ;
  • 김태신 (건국대학교 전자.정보통신공학과) ;
  • 허정 (건국대학교 전자.정보통신공학과) ;
  • 이상영 (건국대학교 물리학과)
  • Published : 2001.07.25

Abstract

In this paper, we designed and fabricated C-band bandpass filter using dielectric resonators. From waveguide cutoff frequency which applied the region between adjacent dielectric resonators, the height of cavity is determined. The cavity's diameter is determined to the twice of dielectric resonator? diameter considering the conductor loss. The resonant frequency of the DR cavity is calculated with non decaying mode analysis. Conventionally, cylindrical dielectric resonator is analysed by Cohn's model which use the decaying mode in the region between dielectric resonator wall and circular cavity wall, which is an approximated method. The external quality factor, $Q_{ex}$ has found with simulation result using Ansoft's Maxwell simulation tool. The designed filter using dielectric resonators with dielectric constant of 45 has the passband center at 5.065GHz. The bandpass filter using dielectric resonators has about 1dB insertion loss, 20MHz bandwidth and more than 30dB attenuation at $f_0+15MHz$.

Keywords

References

  1. D. Kajfez and P. Guillon, Dielectric Resonator, Artech House, 1986
  2. S. B. Cohn, 'Microwave bandpass filters containing high-Q dielectric resonators', IEEE Trans. Microwave Theory and Tech., vol. MTT 16, pp. 218-227, April 1968
  3. 최홍주, 이원희, 허정, 최광제, 이상영, '동심 유전체 봉이 삽입된 원통형 공진기의 정확한 전자계 표현', 한국전자파학회논문지, 제 11권 제 8호, pp.1399-1406, 2000년 12월
  4. 최홍주, 이원희, 허정, 최광제, 이상영, '유전체 디스크가 삽입된 원통형 공동 공진기에서 Contour Graph 방법을 이용한 공진주파수 계산', 한국전자파학회논문지, 제 11권 제 8호, pp.1420-1427, 2000년 12월
  5. D. M. Pozar, Microwave Engineering, Addison Wesley, 1993
  6. G. Matthaei, L. Young, and E. M. T. Jones, Microwave Filters, Impedance Matching Networks, and Coupling Structures, Artech House, 1980
  7. J. K. Plourde and C. L. Ren, 'Application of Dielectric Resonators in Microwave Components', IEEE Trans. Microwave Theory and Tech., vol. MTT-29, No.8 pp, 754-770, August 1981
  8. S. Y. Lee et al., 'Use of a Dielectric Loaded Cylindrical Cavity in Measurements of the Microwave Surface Resistances of High Tc Superconducting Thin Films'. IEEE Transaction on Applied Superconductivity', 1997 https://doi.org/10.1109/77.620985