Abstract
Based on the linear piezoelectricity theory, this paper sets up and solves the surface acoustic wave (SAW) wave equation with gyroscopic effect in the piezoelectric medium. Taking three typical piezoelectric materials, quartz, LiNbO3 and PZT-5H as examples, the influence of substrate rotation on SAW propagation characteristics is analyzed and compared quantitatively. According to the theoretic calculations, not only the different materials but also the same materials with different cut orientations and propagation directions have different SAW gyroscopic effects. Furthermore, the sensitivity of the gyroscopic effect is related to the rotation direction. When the substrate suffers rotation, in most cases the formerly decoupled wave would generate new coupling, but others with certain cuts and rotation axes remain the decoupled state. The rotation induced change of SAW dispersion relation and propagation parameters should be considered and studied when designing SAW gyroscope. The investigations mentioned above provide theoretical guide for the research of SAW devices with gyroscopic effect.
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