Fundamental charge distributions for surface-wave interdigital transducer analysis

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Fundamental charge distributions for surface-wave interdigital transducer analysis

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© The Institution of Electrical Engineers
Published

The response of transducers with arbitrary polarity sequences can be expressed simply, allowing for electrostatic neighbour effects, by using as an element factor the charge distribution obtained for excitation of one electrode. New calculations of this element factor are presented for a range of metallisation ratios. Treating interelectrode gaps as elementary sources gives an element factor which is less dependent on frequency.

Inspec keywords: ultrasonic transducers; surface acoustic wave devices

Other keywords: metallisation ratios; element factor; charge distributions; electrostatic solution; SAW interdigital transducer

Subjects: Ultrasonics, quantum acoustics, and physical effects of sound; Transduction; devices for the generation and reproduction of sound; Acoustic wave devices

References

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      • H. Engan . Surface acoustic wave multielectrode transducers. IEEE Trans. , 395 - 401
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      • H. Engan . Excitation of elastic surface waves by spatial harmonics of interdigital transducers. IEEE Trans , 1014 - 1017
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      • R.F. Milson , N.H.C. Reilly , M. Redwood . Analysis of generation and detection of surface and bulk acoustic waves by interdigital transducers. IEEE Trans. , 147 - 166
    4. 4)
      • Lewis, B., Jordan, P.M., Milsom, R.F., Morgan, D.P.: `Charge and field superposition methods for analysis of generalised SAW interdigital transducers', catalogue 78CH 1344-1SU, IEEE ultrasonic symposium, 1978, p. 709–714.
    5. 5)
      • Hartmann, C.S., Secrest, B.G.: `End effects in interdigital surface wave transducers', IEEE ultrasonic symposium, 1972, p. 413–416.
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      • R.F. Milsom , M. Redwood , N.H.C. Reilly , H. Matthews . (1977) The interdigital transducer, Surface wave filters.
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      • S. Datta , B.J. Hunsinger , D. Malocha . A generalised model for periodic transducers with arbitrary voltages. IEEE Trans. , 235 - 242
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