Piezoelectric thickness shear resonator

摘要

The device has a piezoelectric substrate (1) and electrodes (2,3) extending from either end to the centre of the substrate. Thickness shear vibrations are generated in a section of the substrate between the first and second electrodes in the central section. The width W of the substrate is less than or equal to 0.7 mm. and fulfils one of the following: a) 0 < W <kT /(1-alpha) or b) k(2n-1)T / (1-alpha) <W <k(2n+1)T/( 1-alpha) or c) 0 <alpha <(fa-fr) / fa, where T is the thickness of the substrate, k=0.5,fa(1-alpha) is an oscillator frequency, fa is an anitiresonance frequency of the resonator, fr is a resonance frequency, alpha is a real constant and n is a positive integer.