• DocumentCode
    1082423
  • Title

    BST-Varactor Tunable Dual-Mode Filter Using Variable {Z}_{C} Transmission Line

  • Author

    Chun, Young-Hoon ; Hong, Jia-Sheng ; Bao, Peng ; Jackson, Timothy J. ; Lancaster, Michael J.

  • Author_Institution
    Heriot-Watt Univ., Edinburgh
  • Volume
    18
  • Issue
    3
  • fYear
    2008
  • fDate
    3/1/2008 12:00:00 AM
  • Firstpage
    167
  • Lastpage
    169
  • Abstract
    Ferroelectric materials like barium-strontium-titanate (BST) have become attractive for microwave tunable circuit applications. This letter presents an investigation of BST-varactor tunable dual-mode filter using variable characteristic impedance or ZC transmission line. The interdigital BST varactors are fabricated and modeled, which are then deployed to realize a bandpass filter with tunable bandwidth capability. The use of tunable impedance line provides additional flexibilities in the design of microwave tunable circuits. A tunable bandpass filter of this type with a center frequency of 1.8 GHz and a bandwidth tuning ratio of 1.15:1 is demonstrated experimentally.
  • Keywords
    band-pass filters; circuit tuning; microwave filters; varactors; BST-varactor; bandpass filter; ferroelectric materials; frequency 1.8 GHz; microwave tunable circuit; tunable dual-mode filter; variable ZC transmission line; Barium–Strontium–Titanate (BST); dual mode filter; ferroelectric material; tunable circuit; tunable filter; varactor;
  • fLanguage
    English
  • Journal_Title
    Microwave and Wireless Components Letters, IEEE
  • Publisher
    ieee
  • ISSN
    1531-1309
  • Type

    jour

  • DOI
    10.1109/LMWC.2008.916778
  • Filename
    4457814
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1082423