Compact microstrip bandpass filters using miniaturized slow-wave quarter-wavelength resonators

Wei Shin Chang*, Cheng Hsien Liang, Chi-Yang Chang

*Corresponding author for this work

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

5 Scopus citations


This paper proposes a novel λ/4 microstrip slow-wave resonator with interdigital capacitive fingers. The interdigital fingers provide a strong capacitive loading so as to miniaturize the resonator size. The resonant frequency is easily adjusted by varying the number of fingers and the spacing between fingers. To demonstrate the feasibility of the proposed structure, one four-pole Chebyshev and one four-pole generalized Chebyshev filter with 0.05 dB equal-ripple bandwidths of 7.5% and 5%, respectively, were designed and fabricated. An extra transmission zero can be close to the passband for high selectivity and stopband attenuation by using the proposed slow-wave resonator and the tapped input/output structure. Both filters are compact in size and exhibit good stopband rejection.

Original languageEnglish
Title of host publication2010 Asia-Pacific Microwave Conference Proceedings, APMC 2010
Number of pages4
StatePublished - 1 Dec 2010
Event2010 Asia-Pacific Microwave Conference, APMC 2010 - Yokohama, Japan
Duration: 7 Dec 201010 Dec 2010

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference2010 Asia-Pacific Microwave Conference, APMC 2010


  • Bandpass filter (BPF)
  • capacitive loading
  • interdigital
  • microstrip line
  • slow wave
  • transmission zero

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