Patent ID: 6877209
Filing Date: 2005-04-12
Classification: B81C,H03H,Y10T

Abstract:
1. A method for sealing an active area of a surface acoustic wave (SAW) device on a wafer, the method comprising: providing a sacrificial material over at least the active area of the SAW device; depositing a seal coating over the wafer so that the seal coating covers the sacrificial material; and replacing the sacrificial material with a target atmosphere, wherein replacing the sacrificial material comprises: lithographically patterning the seal coating to create a via through the seal coating and to expose electrical contact pads coupled to transducer structures of the SAW device for conducting electrical current to and from the transducer structures; etching the sacrificial material by way of the via to create a pocket surrounded by the seal coating; placing the wafer in the target atmosphere; and filling the via to seal the target atmosphere in the pocket.