Wide piezoelectric tuning of LTCC bandpass filters

Mahmoud Al-Ahmad, Ruth Maenner, Richard Matz, Peter Russer

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

27 Scopus citations

Abstract

The increasing number of frequency bands and services in wireless communications is causing a demand for analogue active and passive frontend components with wide bandwidth or tuning range, respectively. Similar to microelectromechanical systems (MEMS), this work presents a parallel plate capacitor with multilayer dielectrics and piezoelectrically movable top electrode as an advantageous tunable element with no addition of any lossy material. When applied as a shunt capacitor in a coupled microstrip-line LTCC bandpass filter, the center frequency of the filter is tuned from 1.1 GHz to 2. 6 GHz with 200 V control voltage and low insertion loss of 2 to 4 dB. The analysis of the device by full-wave simulation reveals a potential tuning range from 0.8 GHz to 2.8 GHz when the thin-film processability of the LTCC surface is properly controlled.

Original languageEnglish
Title of host publication2005 IEEE MTT-S International Microwave Symposium Digest
Pages1275-1278
Number of pages4
DOIs
StatePublished - 2005
Event2005 IEEE MTT-S International Microwave Symposium - Long Beach, CA, United States
Duration: 12 Jun 200517 Jun 2005

Publication series

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

Conference

Conference2005 IEEE MTT-S International Microwave Symposium
Country/TerritoryUnited States
CityLong Beach, CA
Period12/06/0517/06/05

Keywords

  • Bonding
  • Ceramics
  • Piezoelectric materials
  • Tunable filter
  • Varactors

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