Transmission-Line Absorptive Bandstop Filters with Wide Passband: Synthesis and Design

Jongheun Lee, Juseop Lee

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


This article discusses a rigorous and straightforward method to synthesize and design a transmission-line-based reflectionless bandstop filter with high performance in terms of reflectionless range. Our design strategy targets to allow a reflectionless bandstop filter to feature three distinguished advantages that are incomparable to others. First, the presented filter structure is capable of producing an exceptional broadband impedance matching performance. Second, it can be designed to have an extended upper passband. Third, an N th-order filter has N coupling structures and each of them is used twice in design. Hence, it is required to design and tune only N coupling structures, whereas other design approaches use more than N distinct coupling structures. Although reflectionless filters having one of the aforementioned features have been reported, one exhibiting all the characteristics has never been reported to date. Fabricated filter examples fully validate the design theory.

Original languageEnglish
Pages (from-to)5371-5380
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12
Publication statusPublished - 2021 Dec 1

Bibliographical note

Publisher Copyright:
© 1963-2012 IEEE.


  • Absorptive filter
  • reflectionless filter

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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