Rigorous design method for distributed-element bandpass filter with reflectionless response at two ports

Gyuwon Lee, Jongheun Lee, Boyoung Lee, Juseop Lee

Research output: Contribution to journalArticlepeer-review


This letter reports an accurate and rigorous design method for a distributed-element reflectionless bandpass filter capable of producing a reflectionless response at two ports simultaneously. The design method relies on novel transmission-line reflectionless filter prototypes. This work presents a stub-based reflectionless filter prototype and its design formulas in terms of a target transmission response. It also provides a stub-less coupled-line reflectionless filter prototype equivalent to the stub-based prototype in case where stubs are not feasible. A second-order bandpass filter has been designed and fabricated to verify the design method. Reasonable agreement between the measured performance and the simulated one has been obtained, confirming that the proposed design is valid.

Original languageEnglish
Pages (from-to)514-516
Number of pages3
JournalElectronics Letters
Issue number13
Publication statusPublished - 2021 Jun

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (No. NRF‐2018R1A2B6006095)

Publisher Copyright:
© 2021 The Authors. Electronics Letters published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.


  • Filters and other networks
  • Microwave circuits and devices
  • Waveguide and microwave transmission line components

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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