DEVICE WITH INTERFACE SOUND WAVES MADE OF LITHIUM TANTALATE

摘要

The invention concerns components with interface sound waves made of lithium tantalate. In the case where two substrates constituting the filter have the same cross-section and the same crystalline orientation, it provides the best cutting angles enabling in particular optimization of the electromechanical coefficient which conditions final performances of the manufactured component. Curves producing variations of the coupling and attenuation coefficient based on the cutting angles and the propagation direction are provided. The values of the main acoustic characteristics of the component for said best cutting angles are likewise provided. The inventive device is used as passive component of the resonator or filter or delay line type, or as integrated device, either in a measuring chain, or in an assembly of devices operating in accordance with the principle of phase code device identification.