Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1983-09-28
1985-03-26
Beha, Jr., William H.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333154, 333196, H03H 925
Patent
active
045075816
ABSTRACT:
At least two frequencies, one on the higher frequency side and the other on the lower frequency side of a desired frequency, are selected from a predetermined set of frequencies, and stripe widths corresponding to the selected frequencies are combined to realize a desired average stripe width which is used to form an electrode structure of a SAW device. At least one electrode configuration of the SAW device includes an alternate arrangement of electrode stripe and free area stripe and the alternate arrangement is divided into a predetermined number of plural sections within each of which a ratio of the number of stripes of a first width to the number of stripes of a second width is set to a predetermined value. The electrode configuration can be prepared without resort to a highly precise mask and can permit highly precise setting of the center frequencies.
REFERENCES:
patent: 3882433 (1975-05-01), Subramanian
patent: 3936774 (1976-02-01), Mellon et al.
patent: 4162465 (1979-07-01), Hunsinger et al.
"90 MHz Band Low Loss SAW Filters", The Inst. of Electr. and Comm. Eng. of Japan, US 81-23, CPM 81-21, p. 33, Jul. 20, 1981.
Hikita Mitsutaka
Tabuchi Toyoji
Beha Jr. William H.
Hitachi , Ltd.
Rebsch D. L.
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