Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1980-08-27
1982-07-20
Miller, J. D.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310335, 333195, H03H 926
Patent
active
043408346
ABSTRACT:
This disclosure concerns surface acoustic wave resonator devices having grating reflectors. The resonator comprises a substrate of piezoelectric material, an input interdigital transducer which converts electrical energy to surface acoustic wave energy, an output interdigital transducer which converts surface acoustic wave energy to electrical energy, first and second grating reflectors arranged in spaced aligned relationship on opposite ends of the substrate with the input transducer and the output transducer interposed therebetween the input transducer and the output transducer.
The first grating reflector, whose aperture length is the same effective length as the input and output transducers, comprises a first group of interconnected parallel spaced conductors, a second group of interconnected parallel spaced conductors and at least one of isolated parallel conductors positioned between the first and second group of conductors. Each conductor of the one group is aligned with a corresponding conductor of the first group and a corresponding conductor of the second group. Each conductor of the first and second group is parallel and electrically interconnected. The second grating reflector is identical with the first grating reflector.
REFERENCES:
patent: 3444482 (1969-05-01), Becker
patent: 3862431 (1975-01-01), Quate et al.
patent: 3952269 (1976-04-01), Bristol
patent: 4166258 (1979-08-01), Tseng
patent: 4204178 (1980-05-01), Mitchell
Haydl, W. H., "Multimode SAW Resonators", 1976 IEEE Ultrasonic Symposium, pp. 287-291.
Shimizu, H., "Control of Waveguide Characteristics and Suppression of Spurious Transverse Modes for SAW Resonators", Japanese Acoustic Soc., p. 80, 1979.
Miller J. D.
Rebsch D. L.
Tokyo Shibaura Denki Kabushiki Kaisha
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