Thermally tunable surface acoustic wave devices

Details Thermally tunable surface acoustic wave devices Thermally tunable surface acoustic wave devices

1997-10-27

2000-04-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313A, 310346, 333155, H01L 4108

Patent

active

060491558

ABSTRACT:
In accordance with the invention, the piezoelectric layer of a SAW device is mechanically coupled to a substrate of temperature-sensitive material having a large coefficient of thermal expansion or contraction. In a preferred embodiment, the temperature-sensitive material is a nickel/titanium alloy having high negative coefficient of thermal expansion of about -200.times.10.sup.-6. The frequency of the device can be tuned by changing the temperature of operation.

REFERENCES:
patent: 3809931 (1974-05-01), White et al.
patent: 3916348 (1975-10-01), Toda et al.
patent: 3943389 (1976-03-01), Hickernell et al.
patent: 4037176 (1977-07-01), Ono et al.
patent: 4110653 (1978-08-01), Hartmann
patent: 4516049 (1985-05-01), Mikoshiba et al.

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