Publisher : The Korean Institute of Electromagnetic Engineering and Science
DOI : 10.5515/KJKIEES.2015.26.11.966
Title & Authors
Compact Cascaded Quadruplet Bandpass Filter Using Modified Coaxial Cavity Resonator with Q-Factor Improvement Jang, Geon-Ho; Wang, Xu-Guang; Lee, Bo-Ram; Park, Nam-Shin;
This paper presents a novel modified coaxial cavity resonator and its application to bandpass filters with compact size and improved quality factor(Q-factor). The proposed resonator is made up of or curved four inner conductive posts within a single cavity, which provides quadruplet to realize bandpass filter. No metallic walls inside the cavity are required, and thus the utilization efficiency of the cavity space is improved. As a result, the unloaded Q can be approximately 15 % higher in comparison to the conventional coaxial resonator, or more than 35 % volume saving can be achieved while maintaining the similar Q-factor value with the conventional designs. In addition, due to the multiple cross-coupling occurring within the cavity, including the source-to-load coupling, four flexible transmission zeros can be created to realize different filtering functions. Simulations as well as experimental results of four- and eight-pole filters are presented to validate this attractive design concept. Good agreement between measured and computed results is obtained.
C. Wang, K. A. Zaki, "Dielectric resonators and filters", IEEE Microw. Mag., vol. 8, no. 5, pp. 115-127, Oct. 2007.
S. J. Fiedziuszko, I. C. Hunter, T. Itoh, Y. Kobayashi, T. Nishikawa, S. N. Stitzer, and K. Wakino, "Dielectric materials, devices, and circuits", IEEE Trans. Microw. Theory Techn., vol. 50, no. 3, pp. 706-720, Mar. 2002.
M. Memarian, R. R. Mansour, "Quad-mode and dualmode dielectric resonator filters", IEEE Trans. Microw. Theory Techn., vol. 57, no. 12, pp. 3418-3426, Dec. 2009.
장건호, 박남신, 김병철, 이돈용, 원정희, 왕욱광, "원통형 삼중모드 유전체 공진기를 이용한 대역 통과 여파기의 설계", 한국전자파학회논문지 26(1), pp. 30-38, 2015년 1월.
G. L. Matthaei, "Comb-line band-pass filters of narrow or moderate bandwidth", Microw. J., vol. 6, pp. 82-91, Aug. 1963.
R. J. Wenzel, "Synthesis of combline and capacitively loaded interdigital bandpass filters of arbitrary bandwidth", IEEE Trans. Microw. Theory Techn., vol. MTT-19, no. 8, pp. 678-686, Aug. 1971.
R. J. Cameron, C. M. Kudsia, and R. R. Mansour, Microwave Filters for Communication Systems: Fundamentals, Design, and Applications, New York, NY, USA: Wiley, 2007.
R. R. Mansour, "Filter technologies for wireless base stations", IEEE Microw. Mag., vol. 5, no. 1, pp. 68-74, Mar. 2004.
M. El Sabbagh, K. A. Zaki, H. W. Yao, and M. Yu, "Full-wave analysis of coupling between combline resonators and its application to combline filters with canonical configurations", IEEE Trans. Microw. Theory Techn., vol. 49, no. 12, pp. 2384-2393, Dec. 2001.
A. R. Harish, J. S. K. Raj, "A direct method to compute the coupling between nonidentical microwave cavities", IEEE Trans. Microw. Theory Techn., vol. 52, no. 12, pp. 2645-2650, Dec. 2004.
A. Morini, G. Venanzoni, and T. Rozzi, "A new adaptive prototype for the design of side-coupled coaxial filters with close correspondence to the physical structure", IEEE Trans. Microw. Theory Techn., vol. 54, no. 3, pp. 1146-1153, Mar. 2006.
R. J. Cameron, "Advanced filter synthesis", IEEE Microw. Mag., vol. 12, no. 6, pp. 42-61, Oct. 2011.
J. B. Thomas, "Cross-coupling in coaxial cavity filterstutorial overview", IEEE Trans. Microw. Theory Techn., vol. 51, no. 4, pp. 1368-1376, Apr. 2003.
H. Wang, Q. X. Chu, "An inline coaxial quasi-elliptic filter withn controllable mixed electric and magnetic coupling", IEEETrans. Microw. Theory Techn., vol. 57, no. 3, pp. 667-673, Mar. 2009.
Y. Wang, M. Yu, "True inline cross-coupled coaxial cavity filters", IEEE Trans. Microw. Theory Techn., vol. 57, no. 12, pp. 2958-2965, Dec 2009.
E. J. Naglich, J. Lee, H. H. Sigmarsson, D. Peroulis, and W. J. Chappell, "Intersecting parallel-plate wave-guide loaded cavities for dual-mode and dual-band filters", IEEE Trans. Microw. Theory Techn., vol. 61, no. 5, pp. 1829-1838, May 2013.
장건호, 강승택, "변형된 원형 버섯 구조의 0차 공진을 이용한 메타 재질 대역 통과 여파기의 설계", 한국전자파학회논문지 21(8), pp. 893- 899, 2010년 8월.
S. Bastioli, R. Snyder, "Evanescent mode filters using strongly-coupled resonator pairs", in IEEE MTT-S Int. Microw. Symp. Dig., 2013.
Mo Hoft, S. Buerger, "Q-factor improvement of combline resonators", German Microwave Conferenece, UIm, Germany, pp. 53-56. Apr. 2005.
C. Liao, C. Chang, "Design of microstrip quadruplet filters with source-load coupling", IEEE Trans. Theory Techn., vol. 53, no. 7, pp. 2302-2308, Jul. 2005.
S. Amari, U. Rosenberg, and J. Bornemann, "Adaptive synthesis and design of resonator filters with source/load-multi resonator coupling", IEEE Trans. Microw. Theory Techn., vol. 50, no. 8, pp. 1969-1978, Aug. 2002.