Temperature compensated surface wave device

H - Electricity – 01 – L

Patent

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356/200, 333/36,

H01L 41/08 (2006.01) H01L 41/22 (2006.01) H03H 9/00 (2006.01) H03H 9/02 (2006.01) H03H 9/15 (2006.01) H03H 9/30 (2006.01) H03H 9/42 (2006.01)

Patent

CA 1049647

ABSTRACT OF THE DISCLOSURE Disclosed is an acoustic surface wave device having reduced temperature coefficient of propagation delay within a desired range of operating temperatures. In one embod- iment the device includes a piezoelectric substrate com- prising X-propagating Y-cut quartz having a cut angle at which point of zero temperature coefficient of propaga- tion delay is at a temperature which is higher than the desired range of operating temperatures. mere 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 coeffi- cient of propagation delay within the desired range of operating temperatures.

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