Piezoelectric filter having a capacitance electrode extending on

Details Piezoelectric filter having a capacitance electrode extending on Piezoelectric filter having a capacitance electrode extending on

1998-07-16

2000-05-16

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333191, 310340, 310349, 310366, H03H 956

Patent

active

060642823

ABSTRACT:
A piezoelectric filter has a significantly reduced size and a sufficient coupling capacitance while avoiding an uneven outer configuration of an overall shape of the filter. The piezoelectric filter includes a first resonating unit and a second resonating unit and a coupling capacitance unit disposed in a piezoelectric substrate. The coupling capacitance unit is provided with a first coupling capacitance electrode located on an upper surface of the piezoelectric substrate and a second coupling capacitance electrode located on a lower surface thereof and the first and second coupling capacitance electrodes are arranged to extend to side edge surfaces of the piezoelectric substrate.

REFERENCES:
patent: 4365181 (1982-12-01), Yamamoto
patent: 5084647 (1992-01-01), Inoue et al.
patent: 5231327 (1993-07-01), Ketcham
patent: 5670919 (1997-09-01), Gamo

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