Piezoelectric filter with a capacitor on a substrate having an u

Details Piezoelectric filter with a capacitor on a substrate having an u Piezoelectric filter with a capacitor on a substrate having an u

1998-03-30

1999-12-14

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333189, 310349, 310366, H03H 954, H03H 960

Patent

active

060023082

ABSTRACT:
A piezoelectric filter is arranged to suppress unnecessary vibrations caused by wiring patterns such as lead-out electrodes to improve filter characteristics. The filter includes a filter section having a pair of resonant electrodes located on an upper surface of a piezoelectric substrate, and a common electrode located on the lower surface of the substrate so as to be opposite to the resonant electrodes. A capacitor connected to the filter section includes a capacitive electrode having the function of a lead-out electrode and located on the upper surface of the piezoelectric substrate, and another capacitive electrode located on the lower surface of the piezoelectric substrate. Lead-out electrodes extend to edges of the piezoelectric substrate. The piezoelectric substrate is unpolarized in a region where at least a portion of the lead-out electrodes is located and in a vicinity of this region.

REFERENCES:
patent: 3624431 (1971-11-01), Machida et al.
patent: 3676724 (1972-07-01), Berlincourt et al.
patent: 5406230 (1995-04-01), Yamamoto

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