Patent ID: 7545017
Filing Date: 2009-06-09
Classification: H01L,H03H

Abstract:
1. A surface acoustic wave (SAW) device wafer level package comprising: a SAW device in which a SAW element is formed on a top surface of a device wafer; a cap wafer which is bonded with a top surface of the SAW device and has a viahole penetrating the cap wafer; a conductive member to fill a part of the viahole; and a sealing line formed on a bottom surface of the cap wafer to be extended from a boundary between the viahole and the bottom surface of the cap wafer; wherein the viahole has a first via portion and a second via portion, the first via portion has a gradually smaller diameter from a bottom surface of the cap wafer until a certain depth, and the second via portion has a gradually greater diameter from the first via portion until a top surface of the cap wafer, and wherein the conductive member is electrically isolated from the sealing line.