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Crystal orientations for natural single phase unidirectional transducer (NSPUDT) on Li2B4O7

Crystal orientations for natural single phase unidirectional transducer (NSPUDT) on Li2B4O7

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New natural single phase unidirectional transducer (NSPUDT) orientations on a lithium tetraborate (Li2B4O7) substrate are reported. The orientations of the Euler angles (0°, 18°,90°) and (0°, 51°, 90°) give an optimum phasing (±45°) between the transduction and reflection centres for an ideal NSPUDT action. The (0°, 78°, 90°) cut with zero temperature coefficient of delay (TCD) gives an NSPUDT with high directivity.

References

    1. 1)
      • Wright, P.V.: `The natural single-phase unidirectional transducer: a new low-loss SAWtransducer', Proc. IEEE Ultrasonics Symp., 1985, p. 58–63.
    2. 2)
      • Thorvaldsson, T., Abbott, B.P.: `Low-loss SAW filters utilizing the natural single phase unidirectionaltransducer (NSPUDT)', Proc. IEEE Ultrasonics Symp., 1990, p. 43–48.
    3. 3)
      • Suzuki, Y., Shimizu, H., Takeuchi, M., Nakamura, K., Yamada, A.: `Some studies on SAW resonators and multiple-mode filters', Proc. IEEE Ultrasonics Symp., 1976, p. 297–302.
    4. 4)
      • Adachi, M., Shiosaki, T., Kobayashi, H., Ohnishi, O., Kawabata, A.: `Temperature compensated piezoelectric lithium tetraborate crystal forhighfrequency surface acoustic wave and bulk wave devices applications', Proc. IEEE Ultrasonics Symp., 1985, p. 228–232.
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