Acoustic wave devices involving perturbation of acoustic velocit

Details Acoustic wave devices involving perturbation of acoustic velocit Acoustic wave devices involving perturbation of acoustic velocit

1975-06-09

1976-03-23

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

With impedance matching

310 82, 310 98, H03H 926, H03H 930, H03H 932, H01L 4118

Patent

active

039463389

ABSTRACT:
Acoustic waveguides, acoustic filters and acoustic reflectors are based upon the discovery of increased acoustic wave velocity in materials such as lithium niobate and lithium tantalate into which a metal such as titanium, nickel or chromium has been diffused. Velocity increases larger than 1 percent have been obtained; and negligible effect on acoustic loss is incurred thereby. The technique and the resulting devices result in a simpler structure than provided by the metallic strips or the ion beam etched surface regions of prior acoustic devices in which velocity perturbations of comparable magnitude have been desired.

REFERENCES:
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Fink-Television Engineering Handbook McGraw-Hill N.Y. 1957, pp. 15-31, 32.
Menlgailis et al. - Bandpass Surface Wave Filters in Proc. 1972 IEEE Ultrasonics Symposium Oct. 1972; pp. 221-225.
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Martin - The Imcon Pulse Compression Filter and its applications in IEEE Trans. on Sonics and Ultrasonics, Vol. 20, Apr. 1973; pp. 104-112.
Wei et al. - Large Refractive Index Change induced by Ion Implantation in Lithium Niobate in Appl. Phys. Ltrs. Vol. 25, No. 6, Sept. 15, 1974; pp. 329-331.
Li et al. - On the Performance and Limitations of the Surface-Wave Resonator using Grooved Reflectors in Proc. 1974 IEEE Ultrasonics, Symp., Milwaukee, Wisconsin, 1974, pp. 257-262.
Smith et al. - Dispersive Rayleigh Wave Delay Line using Gold on Lithium Niobate in IEEE Trans. on Microwave Theory and Techniques, Nov. 1969, pp. 1043-1044.
Marshall et al. - Theory and Design of the Surface Acoustic Wave Multistrip Coupler in IEEE Trans. on Sonics and Ultrasonics, Apr. 1973, pp. 124-133.
Hartemann - Surface-Acoustic-Wave Guidance Produced by Ion Implantation in Quartz in Electronics Letters, Apr. 4, 1974; pp. 110-111.
Schmidt et al. - Metal-Diffused Optical Waveguides in LiNb0.sub.3 in Appl. Phys. Ltrs. Vol. 25, No. 8, Oct. 15, 1974; pp. 458-460.
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