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Abstract
We study the effects of electrode configuration of quartz thickness-shear mode trapped-energy resonators on their basic vibration characteristics. Free and electrically forced vibration analyses are performed on a rectangular trapped-energy resonator by COMSOL, focusing on the effects of the extended parts of the electrodes leading from the main rectangular parts of the crystal plate. Results show that the effect of the extended parts on resonant frequencies is of the order of 100 ppm. They also displace the mode center which has further implications in resonator frequency stability. These effects are nonnegligible, and should be taken into consideration in resonator design.