Broadband balanced filter with high common-mode suppression and wide stopband based on SIW and SSPP

Hao Liu, B Xue, Jun Xu

Research output: Contribution to journalLetterScientificpeer-review

1 Citation (Scopus)
7 Downloads (Pure)


This paper introduces a novel balanced bandpass filter (BPF) that utilizes the symmetrical F-shaped groove (SFG) substrate-integrated waveguide and spoof surface plasmon polariton (SIW-SSPP) structure. This design combines lowpass SSPP unit cells within a highpass balanced dual-layer SIW structure to realize bandpass filtering response. The SFG SIW-SSPP unit cell’s superior dispersion properties contribute to broad bandwidth and extensive stopband. Additionally, the balanced dual-layer SIW structure, achieved by removing a rectangular aperture from the common ground, allows for high in-band common-mode (CM) suppression and a broad CM suppression range. The proposed filter offers multiple variables to regulate the passband’s lower and upper cut-off frequencies independently. A fabricated prototype of the balanced filter is tested, demonstrating superior performance compared to previously reported balanced SIW and half-mode SIW BPFs. The filter achieves a broad 3-dB fractional bandwidth of 46.55% (6.33-10.17GHz), a wide 20-dB stopband rejection up to 2 f0 (f0: the passband’s center frequency), and simultaneous broad CM suppression range (24-dB up to 4.85 f0).
Original languageEnglish
Number of pages6
Issue number1
Publication statusPublished - 2024
MoE publication typeB1 Non-refereed journal articles


  • Balanced bandpass filter
  • Broadband
  • Common-mode suppression
  • Spoof surface plasmon polariton
  • Substrate-integrated waveguide
  • Wide stopband


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