A new systematic design method based on coupling matrix and non-resonant structure for HTS filters with multiple transmission zeros

Qingyu Kong, Xilong Lu, Guangsong Wei, Shigang Zhou, Yuhang Yang, Liguo Zhou, Qingyue Liu, Rui Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

Paper proposes a new systematic design method based on coupling matrix theory and non-resonant structure for high-temperature superconducting (HTS) filters, which can introduce more transmission zeros (n + X) than the conventional coupling matrix theory. The proposed approach not only introduces transmission zeros at the near end of the passband through a coupling matrix, but also introduces transmission zeros at the far end of the passband through a new non-resonant structure. The non-resonant structure is realized by a grounded microstrip line structure, and the exact expression of the non-resonant structure is derived through the equivalent circuit. To demonstrate the proposed method, two-order, four-order and six-order filters are designed. The effectiveness of the methods is verified through simulations and experiments, with results that closely match theoretical calculations.

Original languageEnglish
Article number045020
JournalSuperconductor Science and Technology
Volume38
Issue number4
DOIs
StatePublished - 1 Apr 2025

Keywords

  • cross-coupling
  • grounded microstrip line (GML)
  • HTS (high-temperature superconducting) filter coupled microstrip line (CML)
  • non-resonant structure
  • transmission zeros

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