Patent ID: 7477117
Filing Date: 2009-01-13
Classification: H03H

Abstract:
1. A surface acoustic wave filter comprising: a piezoelectric substrate; acoustic tracks on the piezoelectric substrate, the acoustic tracks being adjacent and electrically interconnected, the acoustic tracks comprising electro-acoustic transducers, the electro-acoustic transducers comprising an input transducer and an output transducer; and shielding structure that is metallic and that is electrically connected to ground, the shielding structure being between the acoustic tracks, the shielding structure shielding a first electro-acoustic transducer in a first acoustic track from a second electro-acoustic transducer in a second acoustic track, wherein the first acoustic track and the second acoustic track are in parallel such that respective surface acoustic wave propagation directions of the first acoustic track and the second acoustic track are parallel to each other.