Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1983-01-03
1985-02-19
Miller, J. D.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333151, 333194, H03H 925
Patent
active
045008078
ABSTRACT:
Disclosed is a surface acoustic wave transmission device comprising a piezoelectric substrate provided thereon with an input and output transducers for transmitting and receiving the surface acoustic wave, a package for accommodating the piezoelectric substrate, and an adhesion layer for fixing the bottom of the piezoelectric substrate to the ground plane of the package. The adhesion layer is made to have a thickness of .lambda..sub.R /2.6 or more wherein .lambda..sub.R : is the wave length of the surface acoustic wave at the main lobe of the operating frequency, so that unnecessary waves caused by bulk wave components are absorbed.
REFERENCES:
patent: 3515910 (1970-06-01), Fritz et al.
patent: 3733590 (1973-05-01), Kaufman
patent: 4028646 (1977-06-01), Ikushima
patent: 4163201 (1979-07-01), Takahashi et al.
patent: 4234859 (1980-11-01), Ikushima
patent: 4364017 (1982-12-01), Tokunaga et al.
Matthews, H., "Surface Wave Filters", Wiley, NY, 1977, pp. 30-41.
Fujita Yuji
Hosaka Norio
Kishimoto Kiyoharu
Yamada Jun
Yuhara Akitsuna
Hitachi , Ltd.
Miller J. D.
Rebsch D. L.
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