Transducer for surface wave filters with an asymmetrical transfe

Details Transducer for surface wave filters with an asymmetrical transfe Transducer for surface wave filters with an asymmetrical transfe

1976-07-20

1978-01-10

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333 72, H01L 4104

Patent

active

040681416

ABSTRACT:
An input transducer for surface wave filters having an asymmetrical transfer function comprises two pairs (5 and 6) of interdigital combs disposed side by side on the same piezoelectric substrate staggered by one quarter of the acoustic wavelength, one having a symmetrical transfer function and the other an anti-symmetrical transfer function. The asymmetrical transfer function filter is obtained by summing the two acoustic waves generated by such an input transducer in a wide band output transducer.

REFERENCES:
patent: 3626309 (1971-12-01), Knowles
patent: 3835422 (1974-09-01), Hartmann
patent: 3968460 (1976-07-01), Moulding
patent: 3991330 (1976-11-01), Isaacs

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