Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1979-12-19
1982-04-06
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333155, H01L 4108
Patent
active
043238092
ABSTRACT:
Surface acoustic wave devices such as reflective array compressors which utilize orthogonal propagation directions are improved by employing a substrate member the surface acoustic wave propagation surface of which exhibits zero temperature coefficient of delay in two orthogonal directions. Temperature compensation means are eliminated and improved performance in relaized by aligning the principal and secondary axes of propagation of the device with the zero temperature coefficient of delay directions. A single cut quartz substrate having its propagation surface defined by a plane coinciding with the Euler angles lambda=0.0.degree.; mu=125.87 (+1-6).degree., theta=45.0.degree. enables realization of the concept with reflective array compressors and other reflective quartz devices.
REFERENCES:
patent: 3956718 (1976-05-01), Weinert et al.
patent: 3999147 (1976-12-01), Otto et al.
Effects of Temperature-Dependent Anisotropy in RAC Devices and a cut of Quartz for a Temperature-Compensated RAC, by D. E. Oats & R. C. Williamson, 1979 Ultrasonics Symposium Proceedings.
The use of Surface-Elastic Wave Reflection Gratings in Large Time-Bandwidth Pulse Compression Filters, Richard Williamson et al., IEEE Transactions on Microwave Theory and Techniques, vol. MIT-21, No. 4, Apr. 1972.
Budd Mark O.
Matthews, Jr. Willard R.
Singer Donald J.
The United States of America as represented by the Secretary of
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