Patent ID: 7199504
Filing Date: 2007-04-03
Classification: H03H

Abstract:
1. A film bulk acoustic resonator filter comprising a plurality of film bulk acoustic resonators each having a top electrode, a bottom electrode, and a piezoelectric layer sandwiched between the top and bottom electrodes, wherein the piezoelectric layer is a single layer and is not divided into separate layers for the respective film bulk acoustic resonators, and the top electrodes of at least two of the film bulk acoustic resonators are connected to associated circuitry, the film bulk acoustic resonator filter further comprising a transmission line of a coplanar waveguide structure, the transmission line being disposed on the single piezoelectric layer and having two ground lines and a signal line disposed between the ground lines, wherein each of the top electrodes of the at least two of the film bulk acoustic resonators connected to the associated circuitry forms part of the transmission line of the coplanar waveguide structure.