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Dispersive delay lines using ultrasonic surface waves

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5 Author(s)

Surface ultrasonic wave delay lines with dispersive time-frequency characteristics have been made using interdigital electrode arrays with variable element spacings on LiNbO3. The devices operate at 60 MHz with low insertion loss and a 3-dB bandwidth over 25 percent. A model has been devised which accurately predicts the phase and amplitude characteristics of the devices. "Weighting" the array to improve the phase characteristic is described.

Published in:

Proceedings of the IEEE  (Volume:57 ,  Issue: 6 )