Reflectionless transducer

Details Reflectionless transducer Reflectionless transducer

1988-03-15

1990-02-20

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333194, H01L 4108

Patent

active

049029258

ABSTRACT:
A reflectionless surface acoustic wave transducer is proposed which has first and second opposed conductive transducer pads on a substrate of piezo-electric material. A plurality of groups of n interdigitated .lambda./4 electrodes extend from the opposed pads to form an elongated transducer. Each group of n interdigitated electrodes has a spacing within the group of .lambda./4 and the spaces between adjacent groups of the interdigitated electrodes are .lambda./2 such that adjacent groups cancel reflections from each other thereby establishing a reflectionless surface acoustic wave transducer.

REFERENCES:
patent: 3401360 (1968-09-01), Bois
patent: 3801937 (1974-04-01), Bristol
patent: 3870975 (1975-03-01), Vasile
patent: 3908137 (1975-09-01), Hunsinger et al.
patent: 4075582 (1978-02-01), Walker
patent: 4353046 (1982-10-01), Hartmann
patent: 4429246 (1984-01-01), Miyajama
patent: 4464597 (1984-08-01), Setsune
patent: 4516094 (1985-05-01), Lee

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