Patent ID: 6670866
Filing Date: 2003-12-30
Classification: H03H

Abstract:
A bulk acoustic wave device having a signal input port, a first signal output port, a second signal output port and a device ground, said device having a resonant frequency and an acoustic wavelength characteristic of the resonant frequency, said device comprising:a first resonator having a first electrode, a second electrode and a first piezoelectric layer disposed between the first and second electrodes; a second resonator having a third electrode, a fourth electrode and a second piezoelectric layer disposed between the third and fourth electrodes; and a dielectric layer, wherein the first resonator and the second resonator are arranged in a stack with the dielectric layer disposed between the second electrode and the third electrode, and wherein the first electrode is coupled to the signal input port, the second electrode is electrically connected to the device ground, the third electrode is coupled to the first signal output port, and the fourth electrode is coupled to the second signal output port.