Novel Tunable Bandpass Filter Realized Using Barium-Strontium-Titanate Thin Films

HT Su, PM Suherman, Timothy Jackson, Frederick Huang, Michael Lancaster

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

A novel three-pole electrically tunable narrow bandpass filter has been fabricated from bi-layer YBCO/Ba0.05Sr0.95 TiO3 thin films. At 77 K, and without bias, the filter has a center frequency of 3.50 GHz and 5.8% bandwidth. Independent application of dc bias to each of the resonators of 120, 182, and 100 V shifted the center frequency to 3.68 GHz. The insertion loss was less than 1.4 dB and return loss was better than 20 dB. A similar filter was made using bi-layer Ag/Ba0.5Sr0.5 TiO3 thin films and measured at room temperature. The insertion loss of the filter was, as expected, much higher, although it showed improved tunability as compared with the YBCO version.
Original languageEnglish
Pages (from-to)2468-2473
Number of pages6
JournalIEEE Transactions on Microwave Theory and Techniques
Volume56
Issue number11
DOIs
Publication statusPublished - 1 Nov 2008

Keywords

  • tunable bandpass filter
  • Ferroelectric films
  • high-temperature superconductor

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