Acoustic wave devices

Details Acoustic wave devices Acoustic wave devices

1977-03-30

1978-09-26

La Roche, Eugene

Wave transmission lines and networks

Coupling networks

With impedance matching

333 70T, 333 72, H03H 930, H03H 904, H03H 926, H04R 1710

Patent

active

041174240

ABSTRACT:
A crystalline body having two or more domains interfacing at respective domain walls is utilized as an acoustic wave device. Input and output transducers and, in some embodiments, acoustic wave reflectors, are disposed on the crystalline body such that the delay experienced, or the path followed, by acoustic waves propagating between the input and output transducers is varied by varying the positions of the domain walls. This, in turn, is accomplished by way of control signals applied across the crystalline body.

REFERENCES:
patent: 3701122 (1972-10-01), Geusic et al.
patent: 3840826 (1974-10-01), Toda et al.
patent: 3918012 (1975-11-01), Peuzin
Toda et al. --"Surface Acoustic Wave Velocities on Gd.sub.2 (MoO.sub.4).sub.3 " in Applied Physics Letters, vol. 22, No. 10, May 15, 1973; pp. 476-477.
Toda et al. -- Variable Delay Devices Using Ferroelastic and Ferroelectric Crystal Gd.sub.2 (MoO.sub.4).sub.3 in IEEE Trans. on Sonics and Ultrasonics, vol. SU 20, No. 4, Oct. 1973; pp. 376-379.

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