Patent ID: 6225877
Filing Date: 2001-05-01
Classification: H03H

Abstract:
A multilayer type piezoelectric filter comprising;a plurality of resonator elements arranged to form a multilayer structure vertically extended, each being surrounded by a frame-like spacer element;a plurality of intermediary printed circuit board elements each interposed between the adjacent resonator elements, each being provided with predetermined conducting patterns on an upper and lower surfaces thereof;a top printed circuit board element arranged on the top of the resonator elements and provided with a predetermined conducting pattern on a lower surface thereof; anda bottom printed circuit board element arranged under the bottom of the resonator elements and provided with a plurality of connection electrodes on a lower surface and predetermined conducting paths on an upper and lower surfaces thereof;said frame-like spacer elements, said top printed circuit board element and said bottom printed circuit board element being bonded together at the peripheral edges thereof;each electrode of each of the resonator elements being connected by means of the conducting patterns provided on the respective printed circuit board elements to one of the connection electrodes on the bottom printed circuit board element to form a predetermined filter circuit.