New Temperature Compensated Materials for SAW Devices,
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MASS
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Large-bandwidth surface acoustic wave SAW devices are in general not small, lightweight, and energy conserving. This is due to the ovens and other energy consuming schemes which are required to compensate for the large temperature coefficient of lithium niobate. Narrow-band SAW devices have, on the other hand, achieved their potential for being small, lightweight, and passive devices due to the temperature-compensated ST-cut of quartz. This paper discusses developments leading to low loss materials with piezoelectric coupling greater than quartz and ultimately comparable to lithium niobate. The major milestone towards this goal has been the discovery of a physical model for describing why known materials are temperature compensated. In searching for new temperature compensated materials, one looks for open lattice structures in which sizable rotations can occur. Promising materials are identified.
- Line, Surface and Bulk Acoustic Wave Devices