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High CM suppression balanced broadband BPF with hybrid hairpin-interdigital structure

Author

Listed:
  • Hong-wei Deng
  • Yong-jiu Zhao
  • Yong Fu
  • Ying He
  • Lu Zhang

Abstract

A compact, high selectivity and good common-mode (CM) suppression balanced broadband bandpass filter (BPF) is proposed using hybrid hairpin-interdigital structure. Under the differential-mode (DM) excitation, the filtering topology is formed by n + 1 quarter-wavelength resonators (QWRs) and n hairpin resonators (HRs) instead of QWRs with coupled-line I/O coupling structure. But, the DM circuit still maintains high selectivity and broadband characteristics of the interdigital BPF. By reasonably choosing the coupling length and the length of the HR, the balanced BPF can not only obtain the desired DM frequency response, but the CM harmonic generated by the HR can be well suppressed by the CM transmission zero created by the coupling between the HR and half-wavelength resonator (HWR). No via-hole ground for the balanced broadband BPF is required, reducing the implementation complexity. Finally, the third-, fifth-, and seventh-order balanced broadband BPF prototypes are designed and fabricated, and the simulated and measured results show a good agreement. The CM signal for seventh-order case has been suppressed below −46.5 dB in the whole DM frequency band.

Suggested Citation

  • Hong-wei Deng & Yong-jiu Zhao & Yong Fu & Ying He & Lu Zhang, 2013. "High CM suppression balanced broadband BPF with hybrid hairpin-interdigital structure," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 27(18), pages 2379-2389, December.
  • Handle: RePEc:taf:tewaxx:v:27:y:2013:i:18:p:2379-2389
    DOI: 10.1080/09205071.2013.851010
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