First-order reflectionless lumped-element lowpass filter (LPF) and bandpass filter (BPF) design

Tae Hak Lee, Boyoung Lee, Ju Seop Lee

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

24 Citations (Scopus)

Abstract

This work presents design methods for first-order reflectionless lumped-element lowpass and bandpass filters. Each of the proposed filter structures contains an impedance matching circuit that can theoretically cancel out the reflected wave. We have derived the analytic design equations so that the reflectionless filters can be designed without using any sophisticated math techniques. In addition, by virtue of the design equations, the reflectionless lowpass and bandpass filters can be designed in a way to produce exactly the same transmitted power ratio as the conventional reflective filters. Both conventional reflective filters and proposed reflectionless filters have been fabricated and measured to verify the newly presented reflectionless filter design theory. The experimental results show that the proposed filter structures have excellent return loss performances in the stopbands as well as in the passbands. In addition, the measured transmitted power ratios of the reflectionless filters are not distinguishable of the reflective filters.

Original languageEnglish
Title of host publication2016 IEEE MTT-S International Microwave Symposium, IMS 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Volume2016-August
ISBN (Electronic)9781509006984
DOIs
Publication statusPublished - 2016 Aug 9
Event2016 IEEE MTT-S International Microwave Symposium, IMS 2016 - San Francisco, United States
Duration: 2016 May 222016 May 27

Other

Other2016 IEEE MTT-S International Microwave Symposium, IMS 2016
CountryUnited States
CitySan Francisco
Period16/5/2216/5/27

Keywords

  • absorptive
  • first-order bandpass filter
  • first-order lowpass filter
  • impedance matching
  • lumped-element

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Lee, T. H., Lee, B., & Lee, J. S. (2016). First-order reflectionless lumped-element lowpass filter (LPF) and bandpass filter (BPF) design. In 2016 IEEE MTT-S International Microwave Symposium, IMS 2016 (Vol. 2016-August). [7540235] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/MWSYM.2016.7540235