Temperature compensated surface acoustic wave devices

Details Temperature compensated surface acoustic wave devices Temperature compensated surface acoustic wave devices

1975-01-03

1976-06-22

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310 82, 310 95, 310 98, 331107A, 331155, 333 72, H03H 926, H03H 930, H03B 532, H01L 4118

Patent

active

039654443

ABSTRACT:
A temperature compensated surface acoustic wave device having an SiO.sub.2 film layer upon a substrate of piezoelectric material. The positive temperature coefficient of delay of the piezoelectric substrate is counterbalanced by the negative temperature coefficient of the SiO.sub.2 layer. The thickness and shape of the SiO.sub.2 layer are chosen to give a zero first order temperature coefficient for the composite device. Lithium niobate and lithium tantalate are preferred piezoelectric materials for the substrate. A high degree of temperature stability is thereby obtained with coupling coefficients much greater than were previously obtained by prior temperature compensated surface acoustic wave devices.

REFERENCES:
patent: 3766496 (1973-10-01), Whitehouse
patent: 3786373 (1974-01-01), Schulz et al.
patent: 3855548 (1974-12-01), Nandi et al.
Weller et al., -"Optical Detection of Acoustic Surface Waves in Layered Substrates:" Theory and Experiment in IEEE Trans. on Sonics and Ultrasonics, vol. SU-21, No. 3, July 1974, pp. 196-203.

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