A novel piezoelectric plate vibration micromachined gyroscope has been proposed in this paper. Differentiating from many piezolectric gyroscopes

it is based on a piezoelectric plate without theuse of any other elastic element. The pienzoelectric plate is excited in the polarization direction to produce thickness extension vibration mace. If there is an input rotation rate on the vibrator

an induced voltage proportional to the angular rate will be produced in the direction perpendicular to the plane composed by the polarization axis and the input angular rate axis according to the Coriolis effect. It can sense two-axis rotation rate. In this paper

the fundamental theory of this piezolectric micro gyroscope is presented. A maero stimulation experiment is described. It is shown that the experimental results are close to the theoretical predictions. borne calculating results of a given micromechanical gyroscope made of PZT film are given.