Temperature Compensated Berlinite for Surface Acoustic Wave Devices.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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The 19.1 propagation X-cut berlinite AlPO4 has been discovered to have cubic temperature compensation for surface acoustic waves SAW. The temperature variations of frequency or time delay over a 35 to 85 degrees C temperature range are comparable to ST-quartz. However, berlinite has at least twice the piezoelectric coupling. This is essential for low insertion loss, broadband SAW devices such as filters and correlators. In addition, 19.1 propagation, X-cut berlinite has lower volume wave spurious than ST-cut quartz. author