Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1989-04-24
1990-04-10
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, H01L 4108
Patent
active
049163485
ABSTRACT:
A grating is positioned on a surface acoustic wave device on a first axis in-line with the delay line for substantially reducing the amount of energy reflected on that axis to the transmitter and receiver. The grating site on the first axis at a position between the delay line and one of the edges of the device. The grating is comprised of a parallel series of grating members each oriented so as to extend at a first angle relative to the first axis, the grating members being generally longitudinally bisected by that axis. An optimum value for the first angle is provided by a theoretical analysis, and experimental results are presented. On the experimental device, the grating is defined by a series of parallel grooves formed in the surface of the device; however, the grating may also be defined by a series of metallic strips mounted on the surface of the device.
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Surface Wave Filters: Design, Construction, and Use; Chapter 9-Reflection Grating Filters, edited by H. Matthews, John Wiley & Sons, 1977, pp. 381-442.
Optical Study of Ultrasonic Diffraction & Focusing in Anistropic Media, by M. G. Cohn, Journal of Appl. Physics, vol. 38, No. 10, Sep. 1967, pp. 3821-3828.
Surface Wave Velocities, by A. J. Slobodnik et al., Microwave Acoustics Handbook, vol. 1A, Air Force Research Labs., Oct. 1973, p. 123.
Beggs Bruce C.
Este Grantley O.
Budd Mark O.
Jones Philip W.
Northern Telecom Limited
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