Patent ID: 6583689
Filing Date: 2003-06-24
Classification: H03H

Abstract:
A four-pole monolithic filter having the constitution in which two sets of monolithic filter elements are formed on a single piezoelectric plate, said monolithic filter elements being electrically connecting to one another in cascade, and comprising:a rectangular piezoelectric plate; a container for encasing therein said piezoelectric plate; first and second connecting electrodes respectively formed in first and second corners positioned on an identical diagonal line of said piezoelectric plate; first and second monolithic filter elements arranged to be mutually electrically connected in cascade between said first and second connecting electrodes on said piezoelectric plate; a third connecting electrode arranged at a central portion of a first long side of said piezoelectric plate for permitting a connecting point for the cascade connection of said first and second monolithic filter elements to be led out thereto; a fourth connecting electrode arranged at a central portion of a second long side of said piezoelectric plate for permitting ground electrodes of said first and second monolithic filter elements to be led out thereto; and first to fourth holding electrodes formed in said container to correspond to said first to fourth connecting electrodes, wherein said first to fourth connecting electrodes are respectively fixed to said first to fourth holding electrodes by means of conductive adhesive thereby holding said piezoelectric plate in said container and establishing electrical conduction of said respective first to fourth connecting electrodes to said first to fourth holding electrodes.