Waveguide for an acoustic charge transport device

Details Waveguide for an acoustic charge transport device Waveguide for an acoustic charge transport device

1991-03-29

1996-05-21

Issing, Gregory C.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

310313R, H03H 900, H01L 4104

Patent

active

055193650

ABSTRACT:
A waveguide for surface acoustic waves comprises a substrate for supporting propagation of surface acoustic waves along a direction at a substrate velocity and a dielectric structure disposed above the substrate along the propagation direction of the surface acoustic waves. The structure includes a central portion disposed along the propagation direction, first and second intermediate portions respectively disposed along each opposed side of the central portion along the propagation direction, and first and second outer portions respectively disposed along each outer side of the first and second intermediate portions along the propagation direction. The central, intermediate and outer portions each has first, second and third intrinsic surface acoustic wave propagation velocities along the propagation direction of the surface acoustic waves, respectively and the first velocity is intermediate of the second and third velocities.

REFERENCES:
patent: 3626334 (1971-12-01), Kayes
patent: 3906432 (1973-09-01), Ash
patent: 4217564 (1980-08-01), Autron
patent: 4330768 (1982-05-01), Huang et al.
patent: 4401956 (1983-08-01), Joshi
patent: 4893161 (1990-01-01), Tanski et al.
patent: 4994772 (1991-02-01), Ballato
Wilkus, "Transverse Mode Compensation of Surface Acoustic Wave Filters" IEEE 1985 Ultrasonics Symposium Proceedings, San Francisco, CA; Oct. 1985.
Schmidt et al. "Thin Film Acoustic Surface Waveguide on Anisotropic Media" IEEE Transactions on Sonic & Ultrasonics, Mar. 1975.

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