VARIABLE DELAY DEVICE

Details VARIABLE DELAY DEVICE VARIABLE DELAY DEVICE

1974-01-02

1977-07-19

Lawrence, James W.

Wave transmission lines and networks

Coupling networks

With impedance matching

310 93, 310 98, H03h 926, H03h 930, H01v 702

Patent

active

040371751

ABSTRACT:
A ferroelectric wave transducer device comprising an unpoled ferroelectric substrate having a substantially sinusoidal poled region at a surface thereof. A metal plate electrode is disposed on the opposing surface of the substrate. In operation an A.C. voltage applied across the two electrodes gives rise to a surface elastic wave in the substrate. Also disclosed is a method of producing a surface wave transducer of the type described. A pair of interdigitated metal electrodes are applied to a surface of an unpoled ferroelectric substrate. A poling potential is applied between the electrodes, preferably while the substrate is heated. The interdigitated electrodes are then removed and a metal plate electrode is applied over the region where the interdigitated electrodes had been. Finally, another metal electrode is applied to the opposite surface of the substrate. Further disclosed is a surface wave variable delay device which includes a metal plate slidably disposed over a sinusoidally poled region. The spacing between the slidable plate and another electrode determines the delay time of the device.

REFERENCES:
patent: 3436688 (1969-04-01), Zilberstein
patent: 3787786 (1974-01-01), Defebvre et al.

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