Dual surface acoustic wave transducer for dual filter, in particular for television receivers

摘要

The surface wave convertor has an interdigital structure of piezoelectric material (1). This structure has components (31,32,32') with convertor fingers which have partial interdigital overlapping. A part structure of a first component (31) has known interdigital overlapping (61) between two first ranges (b,c/b',c'). At least one other component (32,32') has finger overlappings (62,63;62',63') of these first ranges with convertor fingers of another range (a;a'). This other range (a;a') can be positioned to the side, between the two first ranges (b,b'/c,c). At least one further range (d;e) with convertor fingers, is positioned to the side of one of the first ranges and has interdigital finger overlapping (42,43) with these fingers.