Tapered transmission line technique based graded matching layers for thickness mode piezoelectric transducers

Sivaram Nishal Ramadas, Richard O'Leary, Anthony Mulholland, Gordon Hayward, Allan Mackintosh, Alexandre Troge, Richard Pethrick

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

1 Citation (Scopus)
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Conventionally, in order to acoustically match thickness mode piezoelectric transducers to a low acoustic impedance load medium, multiple quarter wavelength (QW) matching layers are employed at the front face of the device. Typically a number of layers, 2-4 in number, are employed resulting in discrete impedance steps within the acoustic matching scheme. This can result in impedance matching with limited bandwidth characteristics. This paper investigates the application of tapered transmission line filter theory to implement a graded impedance profile, through the thickness of the matching layer scheme, to solve the impedance mismatch problem whilst accounting for enhanced transducer sensitivity
and bandwidth.
Original languageEnglish
Title of host publication2009 IEEE International Ultrasonics Symposium
Place of PublicationPiscataway
Number of pages4
ISBN (Print)9781424443895
Publication statusPublished - 22 Sep 2009
Event2009 IEEE Ultrasonics Symposium - Rome, Italy
Duration: 20 Sep 200923 Sep 2009


Conference2009 IEEE Ultrasonics Symposium


  • acoustic transducers
  • graded matching layer
  • acoustic devices
  • acoustic waves
  • bandwidth
  • filtering theory
  • impedance matching
  • matched filters
  • piezoelectric transducers

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