Piezoelectric filter

Details Piezoelectric filter Piezoelectric filter

1992-09-25

1994-03-15

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310366, H01L 4108

Patent

active

052948609

ABSTRACT:
A piezoelectric filter in which an earth electrode is provided in the center of a piezoelectric substrate in the direction of thickness; an input electrode is provided on the upper surface of the piezoelectric substrate so as to be opposed to one part of the earth electrode; an output substrate is provided on the lower surface of the piezoelectric substrate so as to be opposed to another part of the earth electrode except the aforementioned one part; a first dummy electrode is formed on the upper surface of the piezoelectric substrate so as to be opposed to the output electrode through the piezoelectric substrate; and a second dummy electrode is formed on the lower surface of the piezoelectric substrate so as to be opposed to the input electrode through the piezoelectric substrate.

REFERENCES:
patent: 5057801 (1991-10-01), Kittaka et al.
patent: 5065066 (1991-11-01), Nakatani et al.
patent: 5084647 (1992-01-01), Inoue et al.

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