Patent ID: 6965281

Claim:
A method for manufacturing FBARs comprising the steps of: a) preparing a wafer; b) forming a plurality of sacrificial layer units on the wafer, the sacrificial layer units being spaced apart from one another at regular distances; c) forming device functional portions on the sacrificial layer units, respectively, each device functional portion having a piezoelectric layer unit, and a plurality of electrodes; d) forming side walls by the use of a first dry film, the side walls being configured to surround the device functional portions formed on the wafer; e) forming air gaps by removing the sacrificial layer units, respectively; f) laminating a second dry film over the side walls, thereby forming roofs of resulting individual packages; g) hardening the first and second dry films forming the side walls and roofs; and h) cutting the wafer on the basis of plural vertical and horizontal lines.