A surface acoustic wave filter for color TV receiver VIF

A surface acoustic wave filter for color TV-VIF with a low insertion loss and high selectivity was developed using modified normal type interdigital transducers. Single-crystalline LiNbO
3
was used as the substrate and the electrodes were formed by photolithographic technique. The ripples in the passband were suppressed by means of a step-type transducer and the sidelobes in the out-of-band were decreased by eliminating some finger elements of the transducer. Filter chip was so small that it could be packaged in a TO-5 type can.