Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1983-12-05
1985-03-12
Beha, Jr., William H.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B313D, 333151, 333154, 333195, H03H 925
Patent
active
045047596
ABSTRACT:
A surface acoustic wave device includes apodized interdigital electrode arrays 2,3 coupled by a multistrip coupler 5. In a device in which the apodization 8 comprises a main lobe flanked by a succession of minor lobes, the effects of diffraction relating to short electrode pair overlaps are reduced by dividing at least the far end of the array into two or more series connected array portions 21, 22. Difficulties arising from unbalanced electrode edge overlaps at transitions 20 between different members of electrode pairs connected in series are reduced by locating such transitions in the region of nulls in the apodization pattern.
REFERENCES:
patent: 4083021 (1978-04-01), Autran et al.
patent: 4160219 (1979-07-01), Kuny
patent: 4342011 (1982-07-01), Iwamoto et al.
patent: 4375624 (1983-03-01), DeVries
patent: 4420728 (1983-12-01), Bower
Ronnekleiv et al., "Design Problems in Surface Wave Filters", IEEE Int'l. Specialist Seminar on Component Performance and Systems Applications of SAW Devices, 1973, pp. 141-151.
Beha Jr. William H.
Franzblau Bernard
Mayer Robert T.
Rebsch D. L.
U.S. Philips Corporation
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