Wide-stopband bandpass filter with symmetrical loaded-stub resonators

Ko Wen Hsu, Ming Ju Tsou, Yu Hsiang Tseng, Wen Hua Tu

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

11 Scopus citations


In this study, a fourth-order wide-stopband bandpass filter using loaded-stub resonators is designed and implemented. The proposed single- and dual-stub resonators are realized to shift the harmonic frequencies by choosing different stub lengths. In this filter, the proposed resonators are arranged at the same fundamental frequency and different higher-order modes to suppress the harmonic responses in the upper stopband. The measured results are in good agreement with the simulated predictions, showing that the rejection levels are better than 30 dB in the stopband up to 12.2 f 0. The fundamental frequency is at 1 GHz designed for ZigBee solutions of IEEE 802.15.4 standard.

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 (BPF)
  • harmonic suppression
  • open stub
  • wide stopband


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