Lateral- and thickness-field coupling in lithium tetraborate
- 13 January 2003
- proceedings article
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
Calculations have previously been made for rotated y-cuts, including the regions where the quasi-extensional and quasi-shear thickness modes have zero temperature coefficients of frequency. This work extends the calculations to doubly rotated bulk-wave resonators, and computes the coupling factors for the three simple-thickness modes driven by thickness (TE) and lateral (LE) quasistatic electric fields as a function of the orientation angles phi and theta , and the direction of the applied lateral field psi . Because of the temperature coefficients of the piezoelectric coupling factors, the temperature coefficient of a resonator depend not only upon orientation, but also upon harmonic number and location of the resonator operating point on the immittance circle. These considerations are addressed.Keywords
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