Compensation technique for the design of wideband surface-acoustic-wave filters using multistrip couplers

The letter describes a technique which can be used to compensate for losses in amplitude response induced by beam profile reshaping by a multistrip coupler when used with weighted surface-acoustic-wave transducers having large time-band-width products. This is achieved by analytically modifying the conventional weighting of the transducers. Experimental results from two filter designs employing this technique are presented.