LAME-MODE PIEZOELECTRIC RESONATORS USING LINBO3 CRYSTALS

Piezoelectric resonators with a simple supporting feature have been in demand for numerous applications. In this paper, it is shown that the Lame modes having vibration nodes at the four corners exist in a rectangular 155° rotated Y-cut LiNbO3 plate with a length-to-width ratio of an integer number. The theoretical analysis of equivalent circuit parameters such as capacitance ratio, indicates that this mode can efficiently be excited piezo-electrically. In addition, it is shown that the experimental results of the impedance characteristic, displacement distribution, and capacitance ratio of the Lame mode resonators agree with the theoretical results. It is proved that the changes in the resonant frequency and the Q value due to the four corner supports are small.