Design of Quasi-Reflectionless Filters with Simple Topologies

Sen Lu, Kai Da Xu, Yingjiang Guo, Qiang Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution


An analysis and design method on a simple quasi-reflectionless (QR) filter topology is proposed. The topology of single-port QR filter is composed by a pair of coupled lines with bandpass response and a cascaded structure with bandstop response. The single-port QR bandpass filter (BPF) and bandstop filter (BSF) can be realized by replacing the corresponding port with lossy resistance in filter topology, and both of them have identical QR property. Finally, a two-port QR BPF is further analyzed and simulated, with good filtering performance and QR property.

Original languageEnglish
Title of host publication2020 Asia-Pacific Microwave Conference, APMC 2020 - Proceeding
EditorsJie Sun, Wai Ho Yu
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9781728169620
Publication statusPublished - 2020 Dec 8
Event2020 Asia-Pacific Microwave Conference, APMC 2020 - Virtual, Hong Kong, Hong Kong
Duration: 2020 Dec 82020 Dec 11

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference2020 Asia-Pacific Microwave Conference, APMC 2020
CountryHong Kong
CityVirtual, Hong Kong


  • Quasi-reflectionless filter
  • bandpass filter (BPF)
  • bandstop filter (BSF)
  • coupled lines
  • microstrip line

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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