Ferroelectric surface acoustic wave devices

Details Ferroelectric surface acoustic wave devices Ferroelectric surface acoustic wave devices

1982-09-17

1984-08-07

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333193, 333196, 29 2535, H03H 9145, H03H 964, H03H 968

Patent

active

044646399

ABSTRACT:
Disclosed is a surface acoustic wave filter based on a ferroelectric crystal having a plurality of ordered domains of alternating polarity. An output interdigital transducer, with at least one pair of electrodes, is deposited on a surface of the crystal so that each of the electrode pairs corresponds to one of the ordered domains, and an input interdigital transducer is oriented on the surface to direct a surface acoustic wave toward the output transducer. In addition, sources of both positive and negative electrical potential may be provided, with a switch for each output electrode pair to selectably apply either the positive or the negative potential to that pair.

REFERENCES:
patent: 2724171 (1955-11-01), Wallace
patent: 3713036 (1973-01-01), Thomann
patent: 3750056 (1973-07-01), Subramanian
patent: 3805195 (1974-04-01), Miller
patent: 3945099 (1976-03-01), Kansy
Staples, et al., A Review of Device Technology for Programmable Surface-Wave Filters, IEEE Trans. Microwave Theor., vol. MTT-21, No. 4, p. 279, (Apr. 1973).

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