Surface acoustic wave apparatus and communication apparatus

摘要

A plurality of interdigital transducers (3-5) are provided in a longitudinally-coupled-resonator manner. The interdigital transducers (3-5) are adjacent to each other, and the pitch of an electrode finger (10/11) located in an end portion of an IDT is made smaller than that of electrode fingers (14) at the other portions in the interdigital transducers, and the duty ratio of the electrode finger (10/11) of which the pitch has been made smaller is set smaller than that of the electrode fingers at the other portions.