Surface-wave delay lines with near-octave bandwidth

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Surface-wave delay lines with near-octave bandwidth

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© The Institution of Electrical Engineers
Published

Efficient operation of lithium-niobate delay lines over bandwidths approaching one octave is reported. The transducers are of a 3-electrode (N = 1) interdigital design. Broad bandwidth to the series-resonant transducer is obtained by the use of a lumped-element impedance invertor coupling network. A 9.1 μs delay line is described, which gives 55% 3 dB bandwidth centred at 235 MHz with 25 dB minimum loss and over 50 dB minimum triple-transit suppression.

Inspec keywords: surface phenomena; ultrasonic transducers; ultrasonic delay lines

Other keywords: lumped element impedance invertor coupling network; lithium niobate; ultrasonic transducer; near octave bandwidth; surface wave delay line

Subjects: Acoustic wave devices

References

    1. 1)
      • E.K. Sittig , F.M. Smits . Recirculating ultrasonic stores: an economical approach to sequential storage with bit rates beyond 100 MHz. Bell Syst. Tech. J. , 659 - 674
    2. 2)
      • W.R. Smith , T.M. Reeder , J.H. Collins , H.J. Shaw . Dispersive Rayleigh wave delay line utilizing gold on lithium niobate. IEEE Trans. , 1043 - 1044
    3. 3)
      • W.R. Smith , H.M. Gerard , J.H. Collins , T.M. Reeder , H.J. Shaw . Analysis of interdigital surface wave transducers by use of an equivalent circuit model. IEEE Trans. , 856 - 864
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