A tunable combline bandpass filter using barium strontium titanate interdigital varactors on an alumina substrate

Jayesh Nath, Dipankar Ghosh, Wael Fathelbab, Jon Paul Maria, Angus I. Kingon, Paul D. Franzon, Michael B. Steer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Scopus citations

Abstract

Barium Strontium Titanate (BST) has a field-dependent permittivity that enables it to be used as a dielectric in a voltage-tunable capacitor or varactor. A tunable combline bandpass filter was designed and characterized using BST varactors fabricated on a polycrystalline alumina substrate with copper metallization and is 14 mm × 14 mm in size. The center frequency of the filter varies from 1.6 to 2.0 GHz with the application of 200 V tuning voltage. A 25% tuning range was achieved using a tuning field strength of 300 kV/cm. The zero bias insertion loss was 6.6 dB and this decreased to 4.3 dB at the high bias state. The return loss was better than 10 dB.

Original languageEnglish (US)
Title of host publication2005 IEEE MTT-S International Microwave Symposium Digest
Pages595-598
Number of pages4
DOIs
StatePublished - Dec 1 2005
Event2005 IEEE MTT-S International Microwave Symposium - Long Beach, CA, United States
Duration: Jun 12 2005Jun 17 2005

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
Volume2005
ISSN (Print)0149-645X

Other

Other2005 IEEE MTT-S International Microwave Symposium
CountryUnited States
CityLong Beach, CA
Period6/12/056/17/05

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Nath, J., Ghosh, D., Fathelbab, W., Maria, J. P., Kingon, A. I., Franzon, P. D., & Steer, M. B. (2005). A tunable combline bandpass filter using barium strontium titanate interdigital varactors on an alumina substrate. In 2005 IEEE MTT-S International Microwave Symposium Digest (pp. 595-598). [1516670] (IEEE MTT-S International Microwave Symposium Digest; Vol. 2005). https://doi.org/10.1109/MWSYM.2005.1516670