Surface acoustic wave filter.

摘要

A frequency characteristic of a surface acoustic wave filter (101) having at least a first transducer (102) and a second transducer (105) is determined by a product of a frequency amplitude characteristic of the first transducer and that of the second transducer so that the electrodes of the both transducers are formed in such a way that third harmonics band in the frequency characteristic of the first transducer is shifted out that of the second transducer in order to prevent third harmonics.