Quarter-wavelength stepped-impedance YBCO resonators for miniaturized dual-band high-Tc superconducting filters

Li Min Wang, Min Chih Chang, Shiun Fa Li, Jhe Wei Liou, Chiuan Yu Shiau, Chung I.G. Hsu, Ching-Her Lee

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


A dual-band high-temperature superconducting (HTS) bandpass filter (BPF) is proposed for wireless local area network applications. Using quarter-wavelength stepped-impedance resonators, the designed filter can be miniaturized and shows a dual-band response. The simulation results show the dual-band feature of two passbands at 2.4 and 5.2 GHz, each with a minimum in-band insertion loss of about 0.02 dB. The filter was made out of patterned double-sided deposited yBa 2 Cu 3 O y (YBCO) films integrated with a gold-coated housing. The realized HTS BPF shows two passbands at 2.41 and 5.24 GHz with minimum insertion losses of 0.86 and 1.97 dB, respectively. The measured results show a good HTS BPF performance. Moreover, the temperature-dependent center frequencies can be well described by the modified two-fluid model based formulas, indicating that the frequency shift in HTS BPF is dominated by the temperature dependence of the magnetic penetration depth.

Original languageEnglish
Article number5067156
Pages (from-to)895-898
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2009 Jun 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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