A ferroelectric-based impedance tuner for adaptive matching applications

Jia Shiang Fu, Xinen Alfred Zhu, Jamie D. Phillips, Amir Mortazawi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

18 Scopus citations

Abstract

A general purpose impedance tuner is proposed for adaptive matching applications to compensate the impedance variations of devices such as antennas or power amplifiers. The impedance tuner, composed of a phase shifter and a variable transformer, is designed based on all-pass networks. Thin-film barium-strontium titanate (BST) parallel-plate capacitors fabricated on sapphire are used as the tuning elements. The impedance tuner is completed by mounting chip inductors and blocking capacitors on the same substrate. On-wafer measurement results show that, at 1.8 GHz, impedance transformation ratio of 4 can be achieved and the dissipation loss for all biasing voltages (0 to 18 V) is less than 5.5 dB.

Original languageEnglish
Title of host publication2008 IEEE MTT-S International Microwave Symposium Digest, MTT
Pages955-958
Number of pages4
DOIs
StatePublished - 2008
Event2008 IEEE MTT-S International Microwave Symposium Digest, MTT - Atlanta, GA, United States
Duration: 15 Jun 200820 Jun 2008

Publication series

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

Conference

Conference2008 IEEE MTT-S International Microwave Symposium Digest, MTT
Country/TerritoryUnited States
CityAtlanta, GA
Period15/06/0820/06/08

Keywords

  • Barium-strontium titanate
  • Impedance matching
  • Phase shifters
  • Transformers
  • Tunable circuits and devices

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