Frequency-Tunable Low-Q Lumped-Element Resonator Bandstop Filter With High Attenuation

Tae Hak Lee, Byungguk Kim, Kangho Lee, William J. Chappell, Juseop Lee

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


This paper presents a new lumped-element absorptive bandstop filter topology. It exhibits infinite attenuation at the center frequency and no reflection regardless of the quality factor (Q-factor) of the resonators. The new topology exhibits the absorptive characteristic with extremely low-Q resonators, whereas an absorptive bandstop filter topology in the literature cannot be used for such resonators. This superiority of the new filter topology is verified by comparing it with the topology in the literature. The filter designed using the new topology can change its center frequency by tuning only the capacitor values of the resonators. A 1.6:1 frequency tuning range maintaining the absorptive characteristic has been obtained by measurement.

Original languageEnglish
Article number7567600
Pages (from-to)3549-3556
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number11
Publication statusPublished - 2016 Nov

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2015R1C1A1A02036754).

Publisher Copyright:
© 2016 IEEE.


  • Bandstop filter
  • filter synthesis
  • frequency tunable filter
  • resonator filter

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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