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SAW and pseudo-SAW properties using matrix methods.

E L Adler1

  • 1Dept. of Electr. Eng., McGill Univ., Montreal, Que.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1994
PubMed
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This study reviews pseudo-surface-acoustic waves (PSAWs) and their properties for piezoelectric devices. New analytical functions simplify calculations for phase velocity and attenuation, aiding material selection for advanced applications.

Area of Science:

  • Materials Science
  • Acoustics
  • Solid State Physics

Background:

  • Pseudo-surface-acoustic waves (PSAWs), also known as leaky SAWs, have been studied for over 25 years.
  • Exploiting PSAWs in piezoelectric devices requires materials with high phase velocity (v(p)), high electromechanical coupling (K(2)), and low attenuation (alphalambda).
  • Existing methods for calculating PSAW properties are not always explicit, hindering material discovery.

Purpose of the Study:

  • To review the fundamental characteristics of surface acoustic waves (SAWs) and PSAWs.
  • To present a matrix method for formulating boundary value problems for piezoelectrics.
  • To derive computationally simple, frequency-independent analytical functions for calculating PSAW properties.

Main Methods:

  • Formulation of mechanically free, open- and short-circuited surface wave boundary value problems for piezoelectrics using the matrix method.

Related Experiment Videos

  • Description of both SAW and PSAW modes.
  • Derivation of analytical functions for calculating alphalambda, v(p), and K(2) for any material orientation.

    • Main Results:

    • Computationally simple, frequency-independent analytical functions were derived for calculating PSAW properties.
    • These functions allow for the calculation of alphalambda, v(p), and K(2) using standard PC software.
    • The relationship between these functions and the effective permittivity concept is demonstrated.
    • Numerical examples show that low-loss orientations for PSAWs are sensitive to material constant values.

    Conclusions:

    • The derived analytical functions provide a simplified approach to calculating PSAW properties.
    • This work facilitates the search for optimal piezoelectric materials for device applications.
    • Understanding the sensitivity of low-loss orientations to material constants is crucial for practical implementation.