WIT Press


Simplifying SAW Calculations

Price

Free (open access)

Paper DOI

10.2495/IMS970391

Volume

15

Pages

8

Published

1997

Size

627 kb

Author(s)

Adam Kawalec

Abstract

Numerical analysis of acoustic wave propagation in YZ lithium niobate covered by ideal periodic metal strips is presented. A Mathematica package has been developed for the analysis. Graphical results are presented for the surface acoustic wave velocity and wave number for wide range of metallization ratios and frequencies. 1 Introduction Interdigital transducers may consist of thousands of metal strips. This allows us to apply an approximation such that the surface acoustic wave (SAW) is excited, propagates and is detected in an infinite periodic system of strips. This key approximation, and the known B10tekjaer's theory [1] are the foundation of a spectral theory for the interdigital transducer (IDT). Spectral theory is a field theory, where we start from fundamental relations, admit some well defined simplifications to get closed analytical expressions

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