Patent ID: 8648671

Claim:
A bulk acoustic wave resonator (BAWR), comprising: a first substrate comprising a via hole positioned in a predetermined area of a bottom surface of the first substrate; a first lamination resonating portion comprising a first air cavity, and a first lower electrode-piezoelectric layer-upper electrode laminate, the first air cavity being positioned above the first substrate, and the first lower electrode-piezoelectric layer-upper electrode laminate being positioned above the first air cavity; a second lamination resonating portion comprising a second air cavity, and a second lower electrode-piezoelectric layer-upper electrode laminate, the second air cavity being positioned above the first substrate, and the second lower electrode-piezoelectric layer-upper electrode laminate being positioned above the second air cavity; and a first electrode portion comprising a cavity, a piezoelectric layer, and an upper electrode positioned on the piezoelectric layer, the first electrode portion being positioned to connect the first lamination resonating portion and the second lamination resonating portion via the upper electrode, and the cavity being positioned below the upper electrode and the piezoelectric layer.