Piezoelectric filter

Details Piezoelectric filter Piezoelectric filter

1990-07-19

1992-01-28

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310358, 310359, 310366, H01L 4108

Patent

active

050846477

ABSTRACT:
A piezoelectric filter of an energy-trapped type utilizing a second harmonic wave of the thickness-extensional vibration mode, characterized in that an earth electrode is formed around the center of a piezoelectric substrate in the direction of thickness, and an input electrode and an output electrode are formed on one or both major surfaces of the piezoelectric substrate so as to be opposed to the earth electrode.

REFERENCES:
patent: 3582839 (1971-06-01), Pim et al.
patent: 4605876 (1986-08-01), Ogawa et al.
patent: 4652784 (1987-03-01), Inoue et al.
patent: 4894577 (1990-01-01), Okamoto et al.
patent: 4894580 (1990-01-01), Ogawa
patent: 4918350 (1990-04-01), Ando et al.
patent: 4939403 (1990-07-01), Kittaka et al.
patent: 4950970 (1990-02-01), Ando et al.

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