Distributed-Element Reflectionless Bandstop Filter with a Broadband Impedance Matching

Jongheun Lee, Juseop Lee

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


In this letter, we present a systematic design method for a reflectionless bandstop filter using distributed-element resonators. One unique feature of the presented filter structure is that it is capable of producing a broadband impedance matching at both ports with a flat passband. For verifying the design approach, a second-order Butterworth reflectionless bandstop filter centered at 2 GHz with fractional bandwidth of 8% has been designed, fabricated, and measured. The measurement shows that the return losses ( S_{11} and S_{22} ) are overall larger than 10 dB from DC to 3f_{0}.

Original languageEnglish
Article number9089216
Pages (from-to)561-564
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
Issue number6
Publication statusPublished - 2020 Jun

Bibliographical note

Funding Information:
Manuscript received February 3, 2020; revised April 11, 2020; accepted April 23, 2020. Date of publication May 7, 2020; date of current version June 5, 2020. This work was supported by the National Research Foundation of Korea (NRF) through the Korea Government (MSIT) under Grant NRF-2018R1A2B6006095. (Corresponding author: Juseop Lee.) The authors are with the Department of Computer and Communications Engineering, Korea University, Seoul 02841, South Korea (e-mail: juseoplee@ gmail.com).

Publisher Copyright:
© 2001-2012 IEEE.


  • Absorptive filter
  • reflectionless filter

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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