Abstract
The strip-type resonator that uses 2nd-harmonic thickness-extensional (TE2-mode) vibration in a two-layered monolithic piezoelectric plate was developed for a ceramic oscillator. By using the TE2-mode vibration, piezoelectric ceramic materials that have better temperature characteristics and higher Qm could be utilized. Furthermore, TE2-mode vibration has no problems such as spurious responses often found in the 3rd-harmonic thickness extensional (TE3-mode) vibration in a single-layered piezoelectric plate. By shaping the resonator into a strip, the resonator was miniaturized. By means of the finite element method, the displacement distribution and the relationship between resonator width and spurious responses were analyzed. From the results, it was clarified that the resonator could be miniaturized and had good frequency characteristics. Those superior characteristics were demonstrated in an experiment. It was recognized that there was no spurious response that disturbed stable oscillation and that the volume of the resonator was less than 1/10 of that of conventional trapped-energy resonators using the TE3-mode vibration in a single-layered piezoelectric plate.
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