Patent ID: 7198725

Claim:
A method for making a SAW device package that includes a SAW die having a piezoelectric substrate, and transmitting and receiving transducers and a cap formed on the substrate, the cap having a peripheral wall and a cover wall which cooperate with the substrate to define an embedded air cavity thereamong, said method comprising the steps of: forming a metal layer on a wafer surface of a wafer through metallization techniques; forming a pattern of a photoresist layer on the metal layer through lithography techniques; etching an exposed portion of the metal layer that is exposed from the photoresist layer so as to form a pattern of the metal layer, which defines the transmitting and receiving transducers of the SAW die, on the wafer surface of the wafer; forming a pattern of a first photo sensitive layer, which defines the peripheral wall of the cap of the SAW die, on the metal layer after etching of the metal layer; forming a pattern of a second photo sensitive layer, which defines the cover wall of the cap of the SAW die, on the first photo sensitive layer; curing the first and second photo sensitive layers; dicing the wafer into SAW dies; and encapsulating the SAW dies with a molding compound.