Patent ID: 7400218

Claim:
A transversal surface acoustic wave filter comprising: a surface acoustic wave substrate; an input transducer arranged on a surface of the surface acoustic wave substrate; and an output transducer arranged on the surface of the surface acoustic wave substrate, the input transducer and the output transducer each including a plurality of electrode fingers slanted in a direction that is substantially perpendicular to a surface acoustic wave propagation direction such that an electrode finger pitch changes in the direction that is substantially perpendicular to the surface acoustic wave propagation direction; wherein when each of the input and output transducers is divided into a plurality of tracks to the extent that an angle of inclination of electrode fingers in a direction that is substantially perpendicular to a surface acoustic wave propagation direction is negligible, an electrode finger pitch of a track of the plurality of tracks of the input transducer is different from an electrode finger pitch of a track of the plurality of tracks of the output transducer; and the electrode finger pitch is defined by a distance between a first electrode finger and a second electrode finger which has the same phase as the first electrode finger in the input and output transducers.