Surface Acoustic Waves in Layered Piezoelectric Medium Loaded with Viscous Liquid

In this paper, we present an analysis of the velocity dispersion and wave attenuation of a layered piezoelectric medium loaded with a viscous liquid. The eight-dimensional formalism of the surface wave and the recursive formula were adopted to obtain the impedance tensor of a piezoelectric layered half-space and that of viscous liquids. The dispersion equation of the surface waves in such a layered system was formulated under the continuity conditions at the solid-liquid interface. Numerical examples of half-space (lithium niobate), single-layered (lithium niobate/sapphire) and double-layered half-space (ST-cut quartz/lithium niobate/sapphire, lithium niobate/ST-cut quartz/sapphire) loaded with a viscous liquid are presented and discussed as well.