Wide piezoelectric tuning of LTCC bandpass filters

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

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

27 Citations (Scopus)


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
Number of pages4
Publication statusPublished - 2005
Externally publishedYes
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
ISSN (Print)0149-645X


Other2005 IEEE MTT-S International Microwave Symposium
Country/TerritoryUnited States
CityLong Beach, CA


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

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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