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Temperature Compensation of Surface Transverse Waves for Stable Oscillator Applications

Abstract : The purpose of this research is to further develop theory describing surface-type acoustic wave resonator and delay line temperature compensation in the high coupling materials such as lithium niobate and lithium tantalate. Several models are developed to predict the temperature behavior of acoustic wave propagation beneath periodic corrugated surface gratings. The grating types considered include grooves, mass loadings strips, conducting strips, and combinations thereof. Temperature and stress characteristics of these acoustic waves are determined not only by the crystalline material properties, mass and stiffness, but also by the structure and dimensions of the surface grating. It is this property that allows the use of a surface grating as an effective means for temperature compesating surface acoustic wave resonators and delay lines of this type. Grating dimensions required to temperature compensate surface transverse wave (STW) propagation normal to the X-axis on rotated Y-cuts of quartz, lithium niobate and lithium tantalate are presented.