Surface acoustic wave design fundamentals

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Authors

  • D.C. MALOCHA Electrical and Computer Engineering Dept., University of Central Florida, United States

Abstract

This paper will provide a fundamental approach to the design of SAW transducers and filters. Although SAW devices are often modeled with complex and large programs, the basic design principles can be analyzed with simple programs and commercially available analysis tools, such as Mathcad or Matlab. The beginning of the paper reviews the basis for the impulse response model. Design equations for fundamental window time functions as applied to apodized transducers will be presented. The development shows an analytical approach to the solution of apodized transducers. The solutions provide the SAW radiating beam profile as a function of frequency as well as the frequency dependent acoustic transducer parameters. The electrical network effects on the overall transducer response are presented which provides a complete first order analysis for fundamental SAW trandsucer design.

References

[1] V. M. RISTIC, Principles of Acoustic Devices, John Wiley, New York, 1983.

[2] C. S. HARTMANN, D. T. BELL, and R. C. ROSENFELD, Impulse Model Design of Acoustic Surface Wave Filters, IEEE Transactions on Microwave Theory and Techniques, MTT-21, pp. 162-175, 1979.

[3] S. DATTA, Surface Acoustic Wave Devices, Prentice Hall, New Jersey, 1986.

[4] D. P. MORGAN, Surface Wave Devices for Signal Processing, Elsevier, Amsterdam, 1991.