A New Class of K-Band High-Q Frequency-Tunable Circular Cavity Filter

Seunggoo Nam, Boyoung Lee, Changsoo Kwak, Juseop Lee

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


A new type of K-band high-Q frequency-Tunable waveguide filters is proposed in this paper. The presented filter structure adopts a new technique for tuning the resonant frequency of each resonator. A dielectric plate is inserted in each resonator and rotating it leads to the frequency tuning. Unlike the conventional frequency tuning methodologies for tunable waveguide cavity filters, the new frequency tuning technique alleviates the electrical grounding issue for tuning devices. In addition, we demonstrate a new design method that allows the filter to have an absolute constant bandwidth in the frequency tuning range without using tunable coupling structures.

Original languageEnglish
Pages (from-to)1228-1237
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number3
Publication statusPublished - 2018 Mar

Bibliographical note

Funding Information:
Manuscript received May 2, 2017; revised September 7, 2017; accepted October 28, 2017. Date of publication December 12, 2017; date of current version March 5, 2018. This work was supported by the Institute for Information and Communications Technology Promotion (IITP) grant funded by the Korean Government (MSIT) (2014-0-00031), Development of Flexible Payload Technologies for Next Satellite Broadcasting and Communications (Corresponding author: Juseop Lee.) S. Nam, B. Lee, and J. Lee are with the Department of Computer and Communications Engineering, Korea University, Seoul, South Korea (e-mail: juseoplee@gmail.com).

Publisher Copyright:
© 1963-2012 IEEE.


  • Bandpass filter
  • frequency tuning
  • waveguide cavity filter

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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