Electrode structure for saw device

Details Electrode structure for saw device Electrode structure for saw device

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.

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