Browse > Article
http://dx.doi.org/10.17661/jkiiect.2018.11.3.313

A Coaxial Band Rejection Filter using a Quarter Wavelength Choke Structure  

Han, Dae Hyun (Department of Electronic Engineering, Dongeui University)
Publication Information
The Journal of Korea Institute of Information, Electronics, and Communication Technology / v.11, no.3, 2018 , pp. 313-318 More about this Journal
Abstract
A coaxial band rejection filter is designed and fabricated for a beam interacting cavity. The proposed filter has a quarter wavelength choke for the dominant mode of the cavity. The equivalent circuit of the coaxial band rejection filter is presented and the ABCD parameter os each part is derived to obtain the ABCD parameter of the entire filter. The scattering matrix was obtained from the ABCD matrix and the was simulated by MATLAB using the obtained scattering matrix. The coaxial band rejection filter structure was simulated using HFSS, and the results confirmed the simulation using the equivalent circuit was useful. The designed coaxial band rejection filter was fabricated with 6-1/8 flange. The fabricated filter was measured using a transition from 6-1/8 flange to N-type flange. The insertion loss of the fabricated filter is greater than 25 dB in the dominant mode of the cavity and less than 0.25 dB in the first higher order mode. The measurement results are in good agreement with the simulated results and meet the design specification.
Keywords
Cavity; Choke; Coaxial Band Rejection Filter; Dominant Mode; Higher Order Mode;
Citations & Related Records
연도 인용수 순위
  • Reference
1 K. Umemori; M. Izawa; K. Saito; S. Sakanaka, "Higher-Order-Mode Damping of L-Band Superconducting Cavity Using A Radial-Line HOM Damper", Proceedings of the 2005 Particle Accelerator Conference, pp. 3606-3608, 2005.
2 Ralph Levy, Tullio E. Rozzi, "Precise Design of Coaxial Low-Pass Filters", IEEE Trans. Microwave Theory and Techn., vol. MTT-16, no. 3, pp 142-147, March 1968.
3 W. Alan Davis, Peter J. Khan, "Coaxial Bandpass Filter Design", IEEE Trans. Microwave Theory and Techn., vol. MTT-19, no. 4, pp 373-380, April 1971.
4 E. Doumanis, S. Bulja, D. Kozlov, "Compact Coaxial Filters for BTS Applications", IEEE Microwave and Wireless Components Letters, vol. 27, no. 12, pp. 1077 - 1079, Dec. 2017   DOI
5 F. Chen, J. Qiu, S. Wong, Q. Chu, "Dual-Band Coaxial Cavity Bandpass Filter With Helical Feeding Structure and Mixed Coupling", IEEE Microwave and Wireless Components Letters, vol. 25, no. 1, pp. 31-33, Jan. 2015   DOI
6 J. M. Osepchuk, J. E. Simpson, and R. A. Foerstner, "Advances in Choke Design for Microwave Oven Door Seal", Journal of Microwave Power, vol 8, no 3/4, 1773.
7 Q. Lu, W. Qin, J. Chen, "A Novel Balanced Bandpass Filter Based on Twin-Coaxial Resonator", IEEE Microwave and Wireless Components Letters, vol. 27, no. 2, pp. 114-116, Feb. 2017   DOI
8 G. Matthaei, Microwave filters, impedance matching networks, and coupling structures, Artech House, 1980.
9 Peter A. Rizzi, Microwave Engineering Passive Circuits, Prentice Hall, 1988.
10 David M. Pozar, Microwave Engineering, John Wiley & Sons Inc.