Multi-transmission-zero quad-band bandpass filter based on quad-mode resonator

Ming Ju Tsou, Wen Hua Tu

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

4 Scopus citations


A sharp-rejection quad-band microstrip bandpass filter with five transmission zeros is proposed. The bandpass filter consists of a quad-mode resonator and two triple-line feeding lines. Analysis on how to control the passband frequencies and the transmission zero frequencies is given. The four passbands are at 1.6 / 2.3 / 3.1 / 5 GHz with the insertion loss of less than 1.2 / 2.2 / 1.2 / 2.3 dB and the return loss of greater than 22 / 14 / 21 / 16 dB. Furthermore, the five transmission zeros are evenly distributed beside the passbands at 1.3, 2.1, 2.7, 4.1, and 6.1 GHz.

Original languageEnglish
Title of host publicationAsia-Pacific Microwave Conference Proceedings, APMC 2011
Number of pages4
StatePublished - 2011
EventAsia-Pacific Microwave Conference, APMC 2011 - Melbourne, VIC, Australia
Duration: 5 Dec 20118 Dec 2011

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


ConferenceAsia-Pacific Microwave Conference, APMC 2011
CityMelbourne, VIC


  • Bandpass filter
  • quad-mode resonator
  • transmission zeros


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