Surface acoustic wave converter with improved frequency characte

Details Surface acoustic wave converter with improved frequency characte Surface acoustic wave converter with improved frequency characte

1996-09-26

2000-02-01

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, H03H 925, H03B 1900

Patent

active

060206721

ABSTRACT:
A surface acoustic wave converter for converting an electric signal into a surface acoustic wave includes an interdigital transducer provided on a piezoelectric substrate. The interdigital transducer has first and second electrode groups each having one or more electrode fingers to which a first signal is almost simultaneously inputted. The surface acoustic wave converters includes first input unit for inputting the first signal to the one or more electrode fingers of the first electrode group, and second input unit for inputting the first signal to the one or more electrode fingers of the second electrode group when at least one of surface acoustic waves excited by the first signal in the one or more electrode fingers of the first electrode group reaches one of the one or more electrode fingers of the second electrode group.

REFERENCES:
patent: 3686518 (1972-08-01), Hartmann et al.
patent: 4625207 (1986-11-01), Skeie
patent: 5164628 (1992-11-01), Egara et al.
patent: 5200663 (1993-04-01), Mochizuki et al.
patent: 5220230 (1993-06-01), Niitsuma
patent: 5367216 (1994-11-01), Egara et al.
patent: 5539687 (1996-07-01), Torisawa et al.

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