Temperature compensated surface wave device

Details Temperature compensated surface wave device Temperature compensated surface wave device

1974-12-23

1976-11-30

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310 95, 310 98, 333 72, H03H 926, H03H 930, H03H 932

Patent

active

039952401

ABSTRACT:
Disclosed is an acoustic surface wave device having reduced temperature coefficient of propagation delay within a desired range of operating temperatures. In one embodiment the device includes a piezoelectric substrate comprising X-propagating Y-cut quartz having a cut angle at which point of zero temperature coefficient of propagation delay is at a temperature which is higher than the desired range of operating temperatures. There is included on the substrate in the desired path of the propagating surface wave a deposit of conductive material which has the effect of lowering the temperature at which the point of zero temperature coefficient of propagation delay occurs, thereby reducing the magnitude of the temperature coefficient of propagation delay within the desired range of operating temperatures.

REFERENCES:
patent: 3786373 (1974-01-01), Schulz et al.
patent: 3818382 (1974-06-01), Holland et al.
patent: 3845420 (1974-10-01), Holland et al.

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