Saw slanted array correlator (SAC) with separate amplitude compensation channel

Claim 1

A surface acoustic wave device comprising: a piezoelectric substrate for propagating surface acoustic waves; an input and an output interdigital transducer aligned with each other on said substrate; said input and output transducers being slanted at predetermined equal and opposite angles to each other; each transducer having a plurality of interdigital electrodes, the periodicity of which varies in a predetermined manner along the length of each transducer, the periodicity variation being the same for corresponding portions of the two transducers; and a reflective array aligned with said interdigital transducers and positioned on said substrate a distance from said output transducer on the side thereof opposite that of said input transducer; said reflective array having a plurality of shorted interdigital electrodes the periodicity of which corresponds to that of the output transducer; said reflective array being disposed on said substrate at an angle the same as that of said output transducer, selected electrodes of said reflective array being at least partially inactivated, the distance between the electrodes of said reflective array and the electrodes of said output transducer being equal to Nλ/2, where N is an integer and λ is acoustic wavelength corresponding to the frequency of operation