Rigorous Design Method for Symmetric Reflectionless Filters with Arbitrary Prescribed Transmission Response

Jongheun Lee, Boyoung Lee, Seunggoo Nam, Juseop Lee

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


In this article, we present a novel generic reflectionless filter topology that can produce an arbitrary predefined transmission response while having the perfect impedance matching at both ports. A detailed procedure for synthesizing reflectionless filters using our topology is also given in this article. One of the unique features of our reflectionless filter topology is that the even- and odd-mode half circuits are not correlated with each other, which makes the filter synthesis straightforward. Hence, the synthesis procedure does not necessitate using either an optimization technique or a numerical method. This article also presents a methodology for transforming a generic topology into a practical one with a reduced number of elements. The presented filter topology and design parameters have been verified by designing lowpass and bandpass filters.

Original languageEnglish
Article number9025777
Pages (from-to)2300-2307
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number6
Publication statusPublished - 2020 Jun

Bibliographical note

Funding Information:
Manuscript received November 7, 2019; revised January 3, 2020; accepted January 15, 2020. Date of publication March 5, 2020; date of current version June 3, 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.) Jongheun Lee, Seunggoo Nam, and Juseop Lee are with the Department of Computer and Communications Engineering, Korea University, Seoul 02841, South Korea (email: [email protected]).

Publisher Copyright:
© 1963-2012 IEEE.


  • Arbitrary transmission response
  • perfect impedance matching
  • symmetric reflectionless filter

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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