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Abstract <p>The paper presents a synthesis of two stepped-impedance resonators (SIR) that provide band-pass filters (BPF) with increased frequency selectivity. Two antiresonant frequencies of these resonators ω<sub>p1</sub> and ω<sub>p2</sub>, which are the poles of their input admittance <i>Y</i><sub>in</sub>, are located close to each other and equidistant from the working resonant frequency. These frequencies generate transmission zeros (TZ) in BPFs with parallel-type resonators near the passband, thereby increasing filter selectivity. Both resonators operate at higher resonant frequencies corresponding to 3λ/4 and 5λ/4 oscillations. This allows the use of these resonators at very high frequencies without reducing their length. The main properties of the synthesized SIRs and the features that enable the simplification of the design process for BPFs based on them are established. The prospects for using the synthesized SIRs in coaxial filter designs are noted. Examples of calculations and frequency responses of SPFs with synthesized resonators and high-frequency selectivity are presented.</p>

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Transmission Line Resonators for Bandpass Filters with Increased Selectivity

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Alexander Zakharov,
  • Sergii Litvintsev,
  • Hlib Avdieienko

摘要

Abstract

The paper presents a synthesis of two stepped-impedance resonators (SIR) that provide band-pass filters (BPF) with increased frequency selectivity. Two antiresonant frequencies of these resonators ωp1 and ωp2, which are the poles of their input admittance Yin, are located close to each other and equidistant from the working resonant frequency. These frequencies generate transmission zeros (TZ) in BPFs with parallel-type resonators near the passband, thereby increasing filter selectivity. Both resonators operate at higher resonant frequencies corresponding to 3λ/4 and 5λ/4 oscillations. This allows the use of these resonators at very high frequencies without reducing their length. The main properties of the synthesized SIRs and the features that enable the simplification of the design process for BPFs based on them are established. The prospects for using the synthesized SIRs in coaxial filter designs are noted. Examples of calculations and frequency responses of SPFs with synthesized resonators and high-frequency selectivity are presented.