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High Selectivity and Wide Stopband Limiting Filter With Dual‐Path Resonators and Quasi‐Lumped Topology.

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Title: High Selectivity and Wide Stopband Limiting Filter With Dual‐Path Resonators and Quasi‐Lumped Topology.
Authors: Feng, Kun1 (AUTHOR), Zhu, Hao‐Ran1 (AUTHOR) hrzhu86@gmail.com
Source: Microwave & Optical Technology Letters. Jun2026, Vol. 68 Issue 6, p1-8. 8p.
Subjects: Bandpass filters, Microwave filters, Transmission zeros, Electric filters, Diodes, Parallel resonant circuits
Abstract: In this paper, a high selectivity and wide stopband limiting filter with dual‐path resonators and quasi‐lumped topology is presented. Dual‐path resonators (DPRs) are employed to realize a bandpass cell with multiple transmission zeros (TZs) on both sides of the passband for skirt selectivity enhancement, which is further improved by stepped‐impedance open stubs (SIOSs). To achieve a wide upper stopband without increasing the circuit size, a quasi‐lumped topology incorporating limiting diodes is designed to introduce additional TZs in the upper stopband for controllable spurious‐response suppression. A prototype of the proposed limiting filter is fabricated with a center frequency f0 of 3.55 GHz. Measurement results show that the stopband is extended up to 5.27f0 with a minimum rejection level of 21.4 dB. The selectivity factor, defined as the ratio of the 15‐dB bandwidth (BW) to the 3‐dB bandwidth, is 1.44. Good agreement between simulated and measured results is observed. [ABSTRACT FROM AUTHOR]
Copyright of Microwave & Optical Technology Letters is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Header DbId: egs
DbLabel: Engineering Source
An: 194919741
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: High Selectivity and Wide Stopband Limiting Filter With Dual‐Path Resonators and Quasi‐Lumped Topology.
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  Data: <searchLink fieldCode="AR" term="%22Feng%2C+Kun%22">Feng, Kun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhu%2C+Hao‐Ran%22">Zhu, Hao‐Ran</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hrzhu86@gmail.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Microwave+%26+Optical+Technology+Letters%22">Microwave & Optical Technology Letters</searchLink>. Jun2026, Vol. 68 Issue 6, p1-8. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Bandpass+filters%22">Bandpass filters</searchLink><br /><searchLink fieldCode="DE" term="%22Microwave+filters%22">Microwave filters</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+zeros%22">Transmission zeros</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+filters%22">Electric filters</searchLink><br /><searchLink fieldCode="DE" term="%22Diodes%22">Diodes</searchLink><br /><searchLink fieldCode="DE" term="%22Parallel+resonant+circuits%22">Parallel resonant circuits</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this paper, a high selectivity and wide stopband limiting filter with dual‐path resonators and quasi‐lumped topology is presented. Dual‐path resonators (DPRs) are employed to realize a bandpass cell with multiple transmission zeros (TZs) on both sides of the passband for skirt selectivity enhancement, which is further improved by stepped‐impedance open stubs (SIOSs). To achieve a wide upper stopband without increasing the circuit size, a quasi‐lumped topology incorporating limiting diodes is designed to introduce additional TZs in the upper stopband for controllable spurious‐response suppression. A prototype of the proposed limiting filter is fabricated with a center frequency f0 of 3.55 GHz. Measurement results show that the stopband is extended up to 5.27f0 with a minimum rejection level of 21.4 dB. The selectivity factor, defined as the ratio of the 15‐dB bandwidth (BW) to the 3‐dB bandwidth, is 1.44. Good agreement between simulated and measured results is observed. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Microwave & Optical Technology Letters is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1002/mop.70666
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 8
        StartPage: 1
    Subjects:
      – SubjectFull: Bandpass filters
        Type: general
      – SubjectFull: Microwave filters
        Type: general
      – SubjectFull: Transmission zeros
        Type: general
      – SubjectFull: Electric filters
        Type: general
      – SubjectFull: Diodes
        Type: general
      – SubjectFull: Parallel resonant circuits
        Type: general
    Titles:
      – TitleFull: High Selectivity and Wide Stopband Limiting Filter With Dual‐Path Resonators and Quasi‐Lumped Topology.
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            NameFull: Feng, Kun
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            NameFull: Zhu, Hao‐Ran
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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              Value: 68
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              Value: 6
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            – TitleFull: Microwave & Optical Technology Letters
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