Patent ID: 6864619

Claim:
A resonator device comprising: a first piezoelectric resonator and a second piezoelectric resonator, wherein the first piezoelectric resonator and the second piezoelectric resonator each have a piezoelectric layer having a first surface and a second surface, a first electrode on the first surface and a second electrode on the second surface; and a detuning layer sequence arranged on the first piezoelectric resonator wherein the detuning layer sequence is arranged on the first electrode of the first piezoelectric resonator or on the second electrode of the first piezoelectric resonator; and the detuning layer sequence comprises at least a first layer having a first acoustic impedance and a second layer having a second acoustic impedance in order to shift a resonance frequency of the first piezoelectric resonator relative to the resonance frequency of the second piezoelectric resonator, wherein the first acoustic impedance is lower than the second acoustic impedance.