Abstract
This paper presents theoretical analyses and experiments of energy trapping of width-shear vibrations in thin piezoelectric strips. By the use of width-shear vibrations, miniaturization of trapped-energy resonators is achieved in the medium-frequency range below several megahertz. The width-shear-mode trapped-energy resonators have some advantages, such as: 1) Excitation electrodes are deposited only on the one side of the plate. 2) The ratio of capacitances of the resonator can widely be varied by the electrode spacing. 3) A specified higher-harmonic mode can easily be suppressed by special electrode arrangement related to stress distribution of the mode. In addition, trapped-energy single-mode filters using the width-shear modes are proposed, and small-sized filters of 455 kHz are constructed.
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