Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1985-02-26
1986-09-02
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, H01L 4108
Patent
active
046098437
ABSTRACT:
The 19.1 propagation X-cut of berlinite (AlPO.sub.4) has been discovered to have cubic temperature compensation for surface acoustic waves (SAW). The temperature variations of frequency or time delay over a 35.degree. to 85.degree. 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.
REFERENCES:
patent: 4012650 (1977-03-01), Pratt et al.
High Piezoelectric Coupling Temperature-Compensated Cuts of Berlinite (ALPO.sub.4) for SAW Applications, by R. M. O'Connell et al., IEEE Transactions on Sonics & Ultrasonics, vol. SU-24, No. 6, Nov. 1977.
Experimental Data on Piezoelectric Properties of Berlinite, Chai et al., 1979 Ultrasonics Symposium, pp. 577-583.
Experimental Determination of the SAW Properties of X-Axis Boule Cuts in Berlinite, Harmon et al., 1978 IEEE, pp. 594-597.
Carr Paul H.
Silva Jose H.
Budd Mark O.
Franz Bernard E.
Singer Donald J.
The United States of America as represented by the Secretary of
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