Unilateral surface wave transducer

Details Unilateral surface wave transducer Unilateral surface wave transducer

1992-09-30

1993-11-23

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313D, 333154, H01L 4108

Patent

active

052647510

ABSTRACT:
In a transducer for surface waves, an alternating succession of transmitter cells and reflector cells is used. The transmitter cells transmit surface waves in phase opposition, leftwards and rightwards. The reflector cells have a reflection coefficient that is in phase opposition between the left-hand side and the right-hand side. The waves transmitted by the transmitter cells interfere with the waves reflected by the reflector cells, destructively in one direction and constructively in the other direction. This enables the making of transducers with spacings equal to .lambda./4 and .lambda./6 only.

REFERENCES:
patent: 3792381 (1979-02-01), Bristol
patent: 3870975 (1975-03-01), Vasile
patent: 3970970 (1976-07-01), Worley
patent: 3987376 (1976-10-01), Kerbel
patent: 4087714 (1978-05-01), La Rosa
patent: 4384228 (1983-05-01), Dias
patent: 5010269 (1991-04-01), Hikita et al.
patent: 5051644 (1991-09-01), Wright
patent: 5061871 (1991-10-01), Wright
Proceedings of the 40th Annual Frequency Control Symposium, 1986, pp. 269-274, T. N. Oliver, et al., "Low Loss, Highly Stable Saw Devices on Quartz".

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