DE2739688

1536614 Surface wave devices MURATA MFG CO Ltd 2 Sept 1977 [3 Sept 1976 18 Jan 1977] 36752/77 Heading H3U A surface wave transducer comprises a plurality of serially-connected comb arrays 30- 44, wherein the arrays having the greatest amount of finger overlap have the least number of fingers and vice versa. This arrangement decreases the total capacitance of the transducer. To suppress a spurious response the finger overlap in the outer arrays may be increased relative to the overlap required to give a desired transfer function. Thus in the transducer of Fig. 16 (not shown) having six arrays, the curve representing the Fourier transform of the transfer function is weighted by a factor 1À5 in the outermost arrays, and by 1À1 in the arrays adjacent thereto.