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Wideband bandpass filter with ultra-wide stopband based on cross-shaped parallel coupled lines

Author

Listed:
  • Litian Wang
  • Xuan Chen
  • Weicheng Peng
  • Lirong Qian
  • Cuiping Li
  • Yahui Tian
  • Honglang Li
  • Dan Li
  • Lin Miao
  • Yang Xiong
  • Xiaokun Bi

Abstract

A broadband out-of-band rejection capability and multiple transmission zeros of wideband bandpass filter are proposed and validated in this article, which employ quadruple anti-parallel coupled-line structures to form a novel cross-shaped resonator planar topology. The centered frequency of the single wideband bandpass filter designed for verification is located at 2.4 GHz (f0) with a fractional bandwidth of 50%. The interaction of crossed multiple anti-coupled lines with a lowpass-loaded fan constitutes the wideband with nine transmission zeros in the 5 f0 frequency range for improved suppression extending to 26.5 GHz (10.7 f0) with a suppression level of 12.5 dB. Moreover, the designed prototype filter is implemented and tested with a measured minimum insertion loss of 0.9 dB. Good agreement between the measured and simulated results is attained to successfully validate the correctness of the proposed design approach.

Suggested Citation

  • Litian Wang & Xuan Chen & Weicheng Peng & Lirong Qian & Cuiping Li & Yahui Tian & Honglang Li & Dan Li & Lin Miao & Yang Xiong & Xiaokun Bi, 2024. "Wideband bandpass filter with ultra-wide stopband based on cross-shaped parallel coupled lines," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 38(8), pages 913-927, May.
    • Handle: RePEc:taf:tewaxx:v:38:y:2024:i:8:p:913-927
    DOI: 10.1080/09205071.2024.2350426
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