Three-terminal filter using area flexural vibration mode

Details Three-terminal filter using area flexural vibration mode Three-terminal filter using area flexural vibration mode

2005-01-11

2005-01-11

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S357000, C310S359000, C310S366000, C310S368000

Reexamination Certificate

active

06842087

ABSTRACT:
A three-terminal filter using the area flexural vibration mode is smaller than filters using the area expansion vibration mode or the length vibration mode, and is easily adjusted to produce a desired frequency by changing the thickness and length of the three-terminal filter. The three-terminal filter includes three electrodes having a substantially square shape, and two piezoelectric layers having a substantially square shape, which are alternately laminated. The piezoelectric layers are polarized in the same thickness direction as the thickness direction, or in opposite thickness directions. The three-terminal filter further includes one surface electrode that functions as an input electrode, another surface electrode that functions as an output electrode, and an internal electrode that functions as a ground electrode.

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patent: 3-14824 (1991-04-01), None
patent: 3-21069 (1991-05-01), None
patent: 2001-036376 (2001-02-01), None

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