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<p>This paper introduces a new design for an interdigital capacitor (IDC) resonator, which results in a modified and improved version of the traditional IDC resonator. By employing fingers (parallel conductive strips) of varying widths in the design, enhanced control over the resonant frequencies is attained. This approach also mitigates undesirable parasitic effects in the IDC that can lead to improved harmonic suppression and common-mode (CM) rejection. For demonstration, a dual-band balanced bandpass filter (B-BPF) with passbands centred at 3.1 GHz and 5.1 GHz is designed and fabricated. Differential-mode (DM) stopband bandwidth of under 15 dB up to 18.9 GHz or 6.1f1 and CM rejection of under 20 dB from 0 to 17.3 GHz is achieved. The measured results for this filter, when compared against the simulation outputs, exhibit a satisfactory level of alignment and corroboration. This innovative filter can contribute to advancing wireless communication technologies, particularly in WiMAX and Wi-Fi 6E systems.</p>

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A Modified IDC Resonator and its Application in Balanced BPFs with Improved Harmonic Suppression

  • 期刊论文

  • 发表日期：

    2025年3月21日

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  • Reza Eskandari,
  • Mohammad Bagher Tavakoli,
  • Farbod Setoudeh,
  • Ashkan Horri

摘要

This paper introduces a new design for an interdigital capacitor (IDC) resonator, which results in a modified and improved version of the traditional IDC resonator. By employing fingers (parallel conductive strips) of varying widths in the design, enhanced control over the resonant frequencies is attained. This approach also mitigates undesirable parasitic effects in the IDC that can lead to improved harmonic suppression and common-mode (CM) rejection. For demonstration, a dual-band balanced bandpass filter (B-BPF) with passbands centred at 3.1 GHz and 5.1 GHz is designed and fabricated. Differential-mode (DM) stopband bandwidth of under 15 dB up to 18.9 GHz or 6.1f1 and CM rejection of under 20 dB from 0 to 17.3 GHz is achieved. The measured results for this filter, when compared against the simulation outputs, exhibit a satisfactory level of alignment and corroboration. This innovative filter can contribute to advancing wireless communication technologies, particularly in WiMAX and Wi-Fi 6E systems.