Case history of a surface-wave TV IF filter for color television receivers

A surface-wave filter constitutes an attractive alternative for the design of the IF section of a television receiver. The detailed requirements for the TV IF channel are set forth, followed by a comparison of the conventional design with the new design involving a surface-wave filter. The surface-wave filter is introduced by a physical description of the transducer configuration. The procedure for fabricating surface-wave filters is described; it is very similar to that of making integrated circuits. The properties of the surface-wave filter are compared with the requirements in terms familiar to electrical engineers, emphasizing advantages and an occasional disadvantage. In a final section, some areas of possible improvement are indicated, showing that this TV IF filter is an advanced first generation device and that further improvements can be expected.