Patent ID: 7538637
Filing Date: 2009-05-26
Classification: H03H

Abstract:
1. An acoustic wave transducer comprising: an acoustic track comprising electrode fingers for different electrodes, the electrode fingers engaging to form exciting finger pairs, the acoustic track comprising marginal areas and an excitation area, the electrode fingers engaging in the excitation area, the marginal areas and the excitation area being located along a transverse direction of the acoustic wave transducer; wherein a longitudinal phase speed of an acoustic wave in the acoustic track is less in a marginal area than in the excitation area; wherein the acoustic wave is excitable and has a transversal basic mode; wherein the following applies in the transversal basic mode for a wave number k wherein k wherein the excitation area comprises partial tracks in the transverse direction, the partial tracks corresponding to partial transducers that are interconnected in series and/or in parallel; wherein the partial tracks are substantially identical in a longitudinal direction, and at least two of the partial tracks have different widths; and wherein the partial tracks have widths that adapt a transversal profile Ψ