BST-varactor tunable dual-mode filter using variable ZC transmission line

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

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


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. © 2008 IEEE.

Original languageEnglish
Article number4457814
Pages (from-to)167-169
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number3
Publication statusPublished - Mar 2008


  • Barium-strontium-titanate (BST)
  • Dual mode filter
  • Ferroelectric material
  • Tunable circuit
  • Tunable filter
  • Varactor


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