Abstract: An acoustic resonator filter comprises a plurality of resonator structures. One or more of the plurality of resonator structures comprises a substrate having a first surface and a second surface. The resonator structure also comprises a piezoelectric layer disposed over the substrate. The acoustic wave resonator structure also comprises a layer disposed between the first surface of the substrate and the second surface of the piezoelectric layer. The layer has a first surface and a second surface. The layer and the piezoelectric layer have a combined thickness (H) selected so an anti-resonance (AR) condition exists for an undesired bulk vertical shear mode between the first surface of the piezoelectric layer and the second surface of the layer.

Abstract: An acoustic resonator filter comprises a plurality of resonator structures. One or more of the plurality of resonator structures comprises a substrate having a first surface and a second surface. The resonator structure also comprises a piezoelectric layer disposed over the substrate. The SAW resonator structure also comprises a layer disposed between the first surface of the substrate and the second surface of the piezoelectric layer. The layer has a first surface and a second surface. The layer and the piezoelectric layer have a combined thickness (H) selected so an anti-resonance (AR) condition exists for an undesired bulk vertical shear mode between the first surface of the piezoelectric layer and the second surface of the layer.