Design of SAW Filters Having Inclined and Tapered Three-Transducer Configuration

A design method for SAW filters with the inclined and tapered three-transducer (ITTT) configuration is described, in which the frequency response of the filter is expressed by an equation utilizing the δ-function model and the apodization is obtained by the least-squares method. Good results were obtained for an example of a TV-intermediate-frequency filter with a non-symmetric amplitude and a linear phase response. However, to design a non-linear phase response, the theory needs to be extended.