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Novel compact quad-mode wideband bandpass filter with wide stopband using T-shaped resonator

Author

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  • J.-M. Huang
  • B. Zhang
  • S.S. Li

Abstract

A novel compact wideband bandpass filter (BPF) with wide stopband is presented to use T-shaped resonator in this paper. The main block of the BPF is a quad-mode stub-loaded resonator which consists of three open-ended stubs loading on a high impendence resonator symmetrically. The transmission characteristics of the quad-mode resonator are analyzed and explained. The upper and lower cut-off frequencies of the passband can be adjusted through simply tuning the dimensions of three open-stubs. A T-shaped resonator is added before the feeding line to create an additional transmission zero which can improve the upper stopband performance. Finally, a BPF with a fractional bandwidth of 43.3% at the center frequency of 3 GHz is designed and measured. Measured results show good agreements with the simulated ones.

Suggested Citation

  • J.-M. Huang & B. Zhang & S.S. Li, 2014. "Novel compact quad-mode wideband bandpass filter with wide stopband using T-shaped resonator," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 28(3), pages 326-333, February.
    • Handle: RePEc:taf:tewaxx:v:28:y:2014:i:3:p:326-333
    DOI: 10.1080/09205071.2013.870053
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