True quadrature taps for s.a.w. delay lines

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True quadrature taps for s.a.w. delay lines

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© The Institution of Electrical Engineers
Published

A novel technique is described in which a combination of geometrically symmetric and antisymmetric interdigital transducers may be employed to produce a constant 90° phase difference between two taps on a surface-acoustic-wave delay line. This relative phase difference is maintained at 90° over the whole transducer bandwidth.

Inspec keywords: ultrasonic transducers; ultrasonic delay lines; surface acoustic wave devices

Other keywords: antisymmetric interdigital transducers; true quadrature taps; surface acoustic wave delay lines; geometrically symmetric interdigital transducers

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

References

    1. 1)
      • B.A. Auld . (1973) , Acoustic fields and waves in solids.
    2. 2)
      • D.C. Champeney . (1973) , Fourier transforms and their physical applications.
    3. 3)
      • F.G. Marshall , C.O. Hewion , E.G.S. Paige . Surface acoustic wave multistrip components and their applications. IEEE Trans. , 216 - 225
    4. 4)
      • R.H. Tancrell , M.G. Holland . Acoustic surface wave filters. Proc. IEEE , 393 - 409
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