Anodic aluminum oxide-epoxy composite acoustic matching layers for ultrasonic transducer application

H. J. Fang, Y. Chen, C. M. Wong, W. B. Qiu, H. L.W. Chan, Jiyan Dai, Q. Li, Q. F. Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)


The goal of this work is to demonstrate the application of anodic aluminum oxide (AAO) template as matching layer of ultrasonic transducer. Quarter-wavelength acoustic matching layer is known as a vital component in medical ultrasonic transducers to compensate the acoustic impedance mismatch between piezoelectric element and human body. The AAO matching layer is made of anodic aluminum oxide template filled with epoxy resin, i.e. AAO-epoxy 1-3 composite. Using this composite as the first matching layer, a ∼12 MHz ultrasonic transducer based on soft lead zirconate titanate piezoelectric ceramic is fabricated, and pulse-echo measurements show that the transducer exhibits very good performance with broad bandwidth of 68% (-6 dB) and two-way insertion loss of -22.7 dB. Wire phantom ultrasonic image is also used to evaluate the transducer's performance, and the results confirm the process feasibility and merit of AAO-epoxy composite as a new matching material for ultrasonic transducer application. This matching scheme provides a solution to address the problems existing in the conventional 0-3 composite matching layer and suggests another useful application of AAO template.
Original languageEnglish
Pages (from-to)29-33
Number of pages5
Publication statusPublished - 1 Aug 2016


  • AAO-epoxy 1-3 composites
  • Matching layer
  • Ultrasonic transducer

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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