Filter using piezoelectric material

Details Filter using piezoelectric material Filter using piezoelectric material

2006-12-26

2006-12-26

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000, C333S196000, C310S31300R

Reexamination Certificate

active

07154360

ABSTRACT:
A filter includes a piezoelectric substrate, and interdigital transducers (IDTs) that are formed on the piezoelectric substrate. At least one of the IDTs has a main electrode finger pattern that is weighted. The IDT having the main electrode finger pattern also has a sub electrode finger pattern that is connected in parallel to the main electrode finger pattern, and generates a surface acoustic wave that cancels a surface acoustic wave caused by leakage electric fields generated in the main electrode finger pattern.

REFERENCES:
patent: 4375624 (1983-03-01), DeVries
patent: 6-232681 (1994-08-01), None
patent: 10-41778 (1998-02-01), None
patent: 10-0168963 (1998-10-01), None

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