2007•Japanese Journal of Applied PhysicsOpen access

Aspect Ratio Dependence of Electromechanical Coupling Coefficient k31 of Lateral-Excitation Piezoelectric Vibrator

Jungsoon Kim, Moojoon Kim, Kanglyeol Ha, Wenwu Cao

Abstract

Using the theory of coupled vibrations, the lateral-excitation mode is theoreticaliy analyszed. As a result, a formula for the electromechanical coupling coefficient k 31 was derived as a function of the aspect ratio between the width and length of a rectangular thin-plate piezoelectric vibrator. This formula can be used in the design for device fabrication using a lateral-excitation-mode piezoelectric vibrator with an arbitrary aspect ratio.

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Key concepts: Vibrator (electronic), Piezoelectricity, Electromechanical coupling coefficient, Excitation, Vibration, Piezoelectric coefficient, Materials science, Coupling coefficient of resonators