| abstract |
Electroacoustic device (5) for generating at least one acoustic wave (Fv,Vx), the device comprising a piezoelectric substrate (10) and first (15) and second (20) groups of electrodes (60,65,70,75) arranged on the substrate, each electrode of the first and second groups comprising a track (80a-f,85a-f,90a-d,95a-d), the tracks (90a-d,95a-d) of the electrodes of the first group spiralling around a same spiral axis (Z) along a first winding direction (W1), and the tracks (80a-f,85a-f) of the electrodes of the second group spiralling around said spiral axis along a second winding direction (W2) opposite to the first winding direction. |