| 摘要 |
A resonator or filter which comprises a bar (1) of piezoelectric material provided with electrodes (2,3) which are spaced from the two ends of the bar. In operation, thickness shear vibrations occur between the electrodes and the bar width to thickness ratio is such that said vibrations in turn produce Nth harmonic flexure vibrations which propagate across the bar width, N being an even number. In order to accelerate the rate of decay of the vibrations towards the (supported and hence energy-absorbant) ends of the bar, and thus to reduce the distance between the electrodes and the ends of the bar for a given quality factor, (N/2-1) slots (4), some of which may be omitted, are provided in each of these ends so that each end is divided into N/2 prongs (5) of equal width. |
