Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1984-02-15
1985-02-12
Miller, J. D.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313R, 333154, 333196, H03H 925, H01L 4108
Patent
active
044993935
ABSTRACT:
A surface acoustic wave (SAW) device configured to operate as a spectrum analyzer, and having an array of input transducers disposed on a substrate in such positions as to produce a focused beam of acoustic energy at a focal arc, each position on the arc being representative of an input signal frequency. Output transducers produce electrical signals corresponding to the energy received at successive segments of the focal arc. The disclosed device includes various combinations of input transducer array improvements, some of which are to provide amplitude weighting of the input array, including aperture width weighting, capacitive weighting, resistive weighting, series-parallel weighting, and source withdrawal weighting. Another improvement in input array configuration eliminates close or overlapping electrodes of opposite polarities and thereby reduces parasitic capacitance and acoustic radiation between electrode elements. The use of curved input transducer fingers improves operation of the transducers as point sources. Other important improvements include the use of acoustic transducers before to transmit the focused output energy from the focal line to conventional output transducers, thereby improving frequency resolution, and the use of electromagnetic waveguides to transmit energy from output transducers located on the focal line.
REFERENCES:
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patent: 3735256 (1973-05-01), Archer et al.
patent: 4328497 (1982-05-01), Vale
Cauvard, P. et al., "Ultrasound Beam Scanning Driven by SAWS" 1978 Ultrasonics Symposium Proceedings, IEEE Cat. 78CH 1344-1SU, pp. 269-272.
Hartemann, P., "Frequency Scanning of Surface Acoustic Wave" Electronics Letters, May 31 '73, vol. 9, No. 11, pp. 246-247.
De La Rue, R. M. et al., "Frequency-Controlled Beam Steering of SAWS", Electronics Letters, July 26 '73, vol. 9, No. 15, pp. 326-327.
Tsal, C. S. et al., "Scanning of SAW Phased Array", Proceedings of the IEEE, Jun. '74, pp. 863-864.
Hartemann, P., et al. "Wavefront Synthesis and Reconstruction Using SAWS", 1977 Ultrasonic Symposium Proceedings, IEEE cat. 77CH1264-1SU, pp. 840-842.
Delaney Michael J.
Kagiwada Reynold S.
Lau Kei-Fung
Stokes Robert B.
Yen Kuo-Hsiung
Heal Noel F.
Miller J. D.
Nyhagen Donald R.
Rebsch D. L.
TRW Inc.
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