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Calculation of Interdigital Transducer Interaction with SAWs and BAWs

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Recent Developments in Surface Acoustic Waves

Part of the book series: Springer Series on Wave Phenomena ((SSWAV,volume 7))

Abstract

Since the interdigital transducer (IDT) was used by WHITE and VOLTMER /1/ in 1965 to excite surface acoustic waves (SAWs) on plane piezoelectric substrates, signal processing devices based on this effect have evolved to a high degree of maturity and are described comprehensively in the book by MORGAN /2/. These devices are fabricated in a one step planar metal layer technology and consist mainly of launching (L) and receiving (R) — IDTs whose structure determines the electric filter characteristic. Simple physical reasoning shows, that the IDT’s SAW impulse response h(t) in a first approximation is given by its structure (i.e. the finger arrangement and mutual finger overlap, called apodisation). Fourier transform (FT −) yields the transfer function \(\bar H\)(w) of the IDT:

$$\bar H\left( w \right) = F{T^ - }\left( {h\left( t \right)} \right).$$
(1)

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References

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Authors and Affiliations

  1. IAEE, Technical University, Gusshausstr. 27-29, A-1040, Wien, Austria

    F. Seifert, A. R. Baghai-Wadji, K. C. Wagner & G. Kovacs

Authors
  1. F. Seifert
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  2. A. R. Baghai-Wadji
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  3. K. C. Wagner
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  4. G. Kovacs
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Editor information

Editors and Affiliations

  1. Department of Theoretical Mechanics, University of Nottingham, NG7 2RD, Nottingham, UK

    David F. Parker

  2. Laboratoire de Modélisation en Mécanique, Université Pierre et Marie Curie, 4 Place Jussieu, F-75252, Paris Cédex 05, France

    Gérard A. Maugin

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© 1988 Springer-Verlag Berlin Heidelberg

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Seifert, F., Baghai-Wadji, A.R., Wagner, K.C., Kovacs, G. (1988). Calculation of Interdigital Transducer Interaction with SAWs and BAWs. In: Parker, D.F., Maugin, G.A. (eds) Recent Developments in Surface Acoustic Waves. Springer Series on Wave Phenomena, vol 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-83508-7_18

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  • DOI: https://doi.org/10.1007/978-3-642-83508-7_18

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-83510-0

  • Online ISBN: 978-3-642-83508-7

  • eBook Packages: Springer Book Archive

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