Patent ID: 6359532
Filing Date: 2002-03-19
Classification: H03H

Abstract:
An energy trapping type piezoelectric filter comprising:a first piezoelectric substrate having an oscillating section, an output connecting terminal and grounding connector terminals; a second piezoelectric substrate having an oscillating section, an input connecting terminal and grounding connector terminals; the first and second piezoelectric substrates being stacked to each other so that the output connector terminal on the first piezoelectric substrate is positioned with respect to the input connector terminal on the second piezoelectric substrate with a certain discrepancy between them in a perpendicular direction; an insulating base plate having a bottom surface provided with an input electrode which is connected to the input connecting terminal, two output electrodes which are connected to the output connecting terminal, and ground electrodes which are connected to the grounding connector terminals, the insulating base plate being arranged as a most bottom layer; and a shielding conductive member provided on an upper surface of the insulating base plate for preventing an electromagnetic coupling between the input electrode and the output electrodes, the shielding conductive member being connected to the ground electrodes.