Abstract
Results of a numerical study of the properties of Surface Acoustic Waves (SAW) on doubly rotated cuts of alpha-quartz are presented. First and second order TCD's have been calculated on a 10' x 10' x 10 grid spanning the range of angles (YX wlt) 0 to 30/-90 to 90/0 to 180'. The finite difference method was employed. SAW velocities were calculated at -50°C, 25'C, and 100 C. The corresponding frequencies were determined and curve fitted. Angular maps created from the data base generated by these calculations were used to identify zero first and second order TCD surfaces. Families of cuts with zero first order TCD and small second order TCD's have been identified and further explored on smaller angular grids (as small as 2.5 x 2.5' x 2.5). Families of cuts on alpha-quartz with SAW temperature stability superior to that found on ST cut quartz are identified. Coupling coefficients, power flow angles, phase-temperature plots, and other parameters are given for selected cuts.
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