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Compact and hybrid dual-band bandpass filter using folded multimode resonators and second-mode suppression

Nicolas Claus (UGent) , Kamil Yavuz Kapusuz (UGent) , Jo Verhaevert (UGent) and Hendrik Rogier (UGent)
(2024) ELECTRONICS. 13(10). p.1-23
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Abstract
The proliferation of the Internet of Things (IoT) propels the continuous demand for compact, low-cost, and high-performance multiband filters. This paper introduces a novel low-profile dual-band bandpass filter (BPF) constructed with a back-to-back coupled pair of shielded folded quarter-mode substrate integrated waveguide (SF-QMSIW) multimode cavities. A hybrid structure is obtained by etching a coplanar waveguide (CPW) coupling line in the folded cavity's septum layer. It serves multiple functions: generating an additional resonance, providing a separate coupling mechanism for the upper passband, and offering the flexibility to control the passbands' center frequency ratio. Additionally, the unused second higher-order mode is suppressed by integrating embedded split-ring resonators (ESRRs) with an inter-digital capacitor (IDC) structure into the feed lines. A filter prototype has been fabricated and experimentally tested. The measurements confirmed reliable operation in two passbands having center frequencies 3.6 GHz and 5.8 GHz, and exhibiting 3 dB fractional bandwidths (FBWs) of 6.4% and 5.3%, respectively. Furthermore, the group delay variation within both passbands equals only 0.62 ns and 1.00 ns, respectively. Owing to the second higher-order mode suppression, the filter demonstrated an inter-band rejection exceeding 38 dB, within a compact footprint of 0.71 lambda g2 (with lambda g being the guided wavelength at the lower passband's center frequency).
Keywords
folded substrate integrated waveguide, embedded split-ring resonator (ESRR), dual-band, bandpass filter (BPF)

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MLA
Claus, Nicolas, et al. “Compact and Hybrid Dual-Band Bandpass Filter Using Folded Multimode Resonators and Second-Mode Suppression.” ELECTRONICS, vol. 13, no. 10, 2024, pp. 1–23, doi:10.3390/electronics13101921.
APA
Claus, N., Kapusuz, K. Y., Verhaevert, J., & Rogier, H. (2024). Compact and hybrid dual-band bandpass filter using folded multimode resonators and second-mode suppression. ELECTRONICS, 13(10), 1–23. https://doi.org/10.3390/electronics13101921
Chicago author-date
Claus, Nicolas, Kamil Yavuz Kapusuz, Jo Verhaevert, and Hendrik Rogier. 2024. “Compact and Hybrid Dual-Band Bandpass Filter Using Folded Multimode Resonators and Second-Mode Suppression.” ELECTRONICS 13 (10): 1–23. https://doi.org/10.3390/electronics13101921.
Chicago author-date (all authors)
Claus, Nicolas, Kamil Yavuz Kapusuz, Jo Verhaevert, and Hendrik Rogier. 2024. “Compact and Hybrid Dual-Band Bandpass Filter Using Folded Multimode Resonators and Second-Mode Suppression.” ELECTRONICS 13 (10): 1–23. doi:10.3390/electronics13101921.
Vancouver
1.
Claus N, Kapusuz KY, Verhaevert J, Rogier H. Compact and hybrid dual-band bandpass filter using folded multimode resonators and second-mode suppression. ELECTRONICS. 2024;13(10):1–23.
IEEE
[1]
N. Claus, K. Y. Kapusuz, J. Verhaevert, and H. Rogier, “Compact and hybrid dual-band bandpass filter using folded multimode resonators and second-mode suppression,” ELECTRONICS, vol. 13, no. 10, pp. 1–23, 2024.
@article{01HYX0NEMVZHYFQNSKDA6Y9ATV,
  abstract     = {{The proliferation of the Internet of Things (IoT) propels the continuous demand for compact, low-cost, and high-performance multiband filters. This paper introduces a novel low-profile dual-band bandpass filter (BPF) constructed with a back-to-back coupled pair of shielded folded quarter-mode substrate integrated waveguide (SF-QMSIW) multimode cavities. A hybrid structure is obtained by etching a coplanar waveguide (CPW) coupling line in the folded cavity's septum layer. It serves multiple functions: generating an additional resonance, providing a separate coupling mechanism for the upper passband, and offering the flexibility to control the passbands' center frequency ratio. Additionally, the unused second higher-order mode is suppressed by integrating embedded split-ring resonators (ESRRs) with an inter-digital capacitor (IDC) structure into the feed lines. A filter prototype has been fabricated and experimentally tested. The measurements confirmed reliable operation in two passbands having center frequencies 3.6 GHz and 5.8 GHz, and exhibiting 3 dB fractional bandwidths (FBWs) of 6.4% and 5.3%, respectively. Furthermore, the group delay variation within both passbands equals only 0.62 ns and 1.00 ns, respectively. Owing to the second higher-order mode suppression, the filter demonstrated an inter-band rejection exceeding 38 dB, within a compact footprint of 0.71 lambda g2 (with lambda g being the guided wavelength at the lower passband's center frequency).}},
  articleno    = {{1921}},
  author       = {{Claus, Nicolas and Kapusuz, Kamil Yavuz and Verhaevert, Jo and Rogier, Hendrik}},
  issn         = {{2079-9292}},
  journal      = {{ELECTRONICS}},
  keywords     = {{folded substrate integrated waveguide,embedded split-ring resonator (ESRR),dual-band,bandpass filter (BPF)}},
  language     = {{eng}},
  number       = {{10}},
  pages        = {{1921:1--1921:23}},
  title        = {{Compact and hybrid dual-band bandpass filter using folded multimode resonators and second-mode suppression}},
  url          = {{http://doi.org/10.3390/electronics13101921}},
  volume       = {{13}},
  year         = {{2024}},
}
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