Elastic surface wave filter

Wave transmission lines and networks – Coupling networks – Electromechanical filter

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Details

330301, 333153, 333154, 333196, H03H 968, H03H 942, H03H 964, H03H 925

Patent

active

042570212

ABSTRACT:
An elastic surface wave filter including on the surface of a plate, an emitting transducer, a surface wave coupler, and means for receiving the waves radiated by the coupler. The means for receiving includes two transducers each having two terminals with one terminal of each being in common with one terminal of the other. The common terminal serves as a phase reference and the voltages induced at the remaining terminals are in phase opposition to one another in the transmission band of the filter.

REFERENCES:
patent: 3626309 (1971-12-01), Knowles
patent: 4160219 (1979-07-01), Kuny
Tancrell, "Improvement of an Acoustic Surface Wave Filter with a Microstrip Coupler", Electronic Letters, Jul. 12, 1973, pp. 316-317.
Marshall et al., "Surface Acoustic Wave Multistrip Components and their Applications", in IEEE Trans. on Microwave Theory and Techniques, vol. MTT-21, No. 4, Apr. 1973, pp. 216-225.

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