Acoustic surface wave device

Details Acoustic surface wave device Acoustic surface wave device

1984-08-17

1988-02-23

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 333153, 333154, 333195, H01L 4108

Patent

active

047272759

ABSTRACT:
A surface acoustic wave device in which the two ports of an input transducer (2) provided on a piezoelectric substrate (1) are coupled to the two ports of an output transducer (3) via respective reflective multi-strip couplers (12, 13). In order to avoid the necessity of providing external tuned matching components to attain the low potential insertion loss of such a device, the number of electrodes and center-to-center distances of the electrodes of at least one of the transducers are chosen so that the impedance of that transducer is substantially real for a range of frequencies which contains the center-frequency of the device response characteristic as determined by the couplers.

REFERENCES:
patent: 3886504 (1975-05-01), Hartmann et al.
patent: 4038614 (1977-07-01), Chapman et al.
patent: 4079342 (1978-03-01), Solie
patent: 4126837 (1978-11-01), Koyamada
patent: 4130813 (1978-12-01), Sandy et al.
patent: 4357584 (1982-11-01), Murray et al.
patent: 4370633 (1983-01-01), Schofield
patent: 4425554 (1984-01-01), Morishita et al.
patent: 4510471 (1985-04-01), Flinn et al.
patent: 4511867 (1985-04-01), Schofield

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