Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1989-10-10
1991-06-04
Lee, Benny
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333195, H01L 4108
Patent
active
050216996
ABSTRACT:
To reduce the frequency bandwidth of an interdigital transducer, acting as an image-impedance connected interdigital transducer in a surface acoustic wave filter with low insertion losses, at least the center-to-center spacing between a first electrode or finger of a first comb, central to the transducer, and a second finger of a second adjacent comb is equal to R.lambda..sub.0 /2, where .lambda..sub.0 is the central wavelength and R is a whole number strictly greater than 1. The center-to-center spacings between the other first and second fingers are at least equal to R.lambda..sub.0 /2. An increase in the optimal length of an image-impedance connected interdigital transistor is obtained by reducing the number of active fingers per unit of length. The greater the reduction factor chosen, the narrower will be the frequency band of the transducer.
REFERENCES:
patent: 3936774 (1976-02-01), Mellon et al.
patent: 3990023 (1976-11-01), Kodama
patent: 4144507 (1979-03-01), Shreve
patent: 4206380 (1980-06-01), Hazama et al.
patent: 4365220 (1982-12-01), Hikita
patent: 4577169 (1986-03-01), Meeker et al.
IEEE Transactions on Sonics and Ultrasonics, vol. SU-26, No. 4, Jul. 1979, pp. 308-312, IEEE, New York, US; F. Sandy.
"Thomson-CSF"
Lee Benny
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