Patent ID: 7205702
Filing Date: 2007-04-17
Classification: H03H,Y10T

Abstract:
1. A film bulk acoustic resonator comprising: a substrate having two opposite edges; a protection layer vapor-deposited on the substrate; a membrane vapor-deposited on the protection layer and spaced at a predetermined distance from an upper side of the substrate; and a laminated resonance part vapor-deposited on the membrane, wherein the laminated resonance part comprises: a lower electrode vapor-deposited on the membrane; a piezoelectric layer vapor-deposited on the lower electrode; and an upper electrode vapor-deposited on the piezoelectric layer, wherein the protection layer is vapor-deposited on two opposite sides of the substrate except for a predetermined part defined by a cavity delimited by the space between said membrane and said upper side of said substrate, and wherein the lower electrode extends from one opposite edge of said substrate, over said cavity, and toward one side of the protection layer but short of said opposite edge of said substrate, and the upper electrode extends from the other opposite edge of said substrate, over said cavity and toward the other side of the protection layer but short of said one opposite edge of said substrate.