Saw tapered transducers

Claim 1

A Surface Acoustive Wave (SAW) transducer which comprises first and second electrodes, each of which comprise a plurality of interdigital electrode fingers positioned such that the spacing between said fingers varies from point-to-point along said transducer and the spacing between said fingers is substantially constant at any given point in order to provide a varying frequency response, wherein said interdigital electrode fingers comprise a pair of outer electrode fingers and a plurality of inner electrode fingers, said outer electrode fingers are relatively wider than said inner electrode fingers, said inner electrode fingers are subdivided into a plurality of sections, and said transducers comprise interconnection electrode connection means from connecting each of said sections to one of said outer electrode fingers, said outer electrode fingers being aligned generally normal to the paths of said surface acoustical waves as they are launched along said SAW transducer, and said inner electrode fingers comprising transducing segments which are also aligned generally normal to the path of said surface acoustical waves and linking segments which are aligned generally normal to said inner electrode transducing segments.