Abstract
We numerically analyzed the influence of strip tab electrodes on the coupled vibrations of the fundamental thickness-shear (TS) and flexural modes in a rectangular AT-cut quartz plate with rectangular central electrodes. It was assumed that the tabs were extended along the x1 (X) axis and softly supported at two points on a single x1-edge of the plate. We calculated the frequency spectra near the main TS response for three types of tab configurations that possessed a twofold rotational symmetry about the crystal X-axis of quartz as well as the rectangular plate and central electrodes. These results verified that the tabs affect the characteristics of coupling between the TS and spurious modes, and demonstrated that the coupling strength depended on both tab width and tab arrangement. We also clarified each property for the three types of tab configurations.
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