Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-07-29
1994-05-03
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H01L 4108
Patent
active
053090578
ABSTRACT:
According to this invention, a weighted transducer for a surface acoustic wave filter includes first and second overlap transducer fingers. The first overlap fingers are formed on a surface of a piezoelectric substrate and have overlap widths continuously changed in a propagation direction of a surface acoustic wave. The second overlap transducer fingers are alternately adjacent to the first overlap transducer fingers in a longitudinal direction of the fist overlap transducer fingers, formed on the surface of the piezoelectric substrate to be electrically connected to each other in parallel and reverse-biased, and have overlap widths of the second overlap transducer fingers continuously changed in the propagation direction of the surface acoustic wave. A sum of the overlap widths of the first and second overlap transducer fingers is always set to be constant in the propagation direction of the surface acoustic wave.
REFERENCES:
patent: 4604595 (1986-08-01), Kadota
Herbert Matthews, "Surface Wave Filter", John Wiley & Sons, Inc., 1977, pp. vii-viii.
M. Hikita et al., "Phase Weighting for Low Loss Saw Filters", 1980 Ultrasonics Symposium, IEEE, pp. 308-316.
Budd Mark O.
NEC Corporation
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