Millimeter-wave bandstop filter with absorptive stopband

Jhih Ying Shao, Yo Shen Lin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

13 Scopus citations


This paper presents a new application of absorptive bandstop filter for absorbing the LO-to-RF leakage of mixer in a Q-band heterodyne receiver. The proposed absorptive bandstop filter (ABSF) is achieved by introducing lossy quarter-wavelength resonator to a conventional narrowband bandstop filter. In order to facilitate the receiver system integration, the proposed ABSF is implemented in commercial GaAs pHEMT process. It is designed with a stopband from 31 to 33 GHz, which is the LO frequency range. The measured stopband rejection is better than 35 dB at the stopband center frequency f0 = 32 GHz. Especially, more than 93.4% of the power within the stopband can be dissipated by the ABSF. In this way, by introducing the proposed ABSF between the image rejection filter and the mixer, the impact of LO-to-RF leakage on the conversion gain of mixer can be minimized.

Original languageEnglish
Title of host publication2014 IEEE MTT-S International Microwave Symposium, IMS 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781479938698
StatePublished - 2014
Event2014 IEEE MTT-S International Microwave Symposium, IMS 2014 - Tampa, FL, United States
Duration: 1 Jun 20146 Jun 2014

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X


Conference2014 IEEE MTT-S International Microwave Symposium, IMS 2014
Country/TerritoryUnited States
CityTampa, FL


  • Absorptive bandstop filter
  • millimeter-wave
  • reflectionless


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