| 摘要 |
An SAW filter includes a piezoelectric substrate (11), an input electrode (12) and an output electrode (13) that are disposed on the piezoelectric substrate (11) and that are each an interdigital electrode, and two reflectors (14) disposed on the piezoelectric substrate (11) and sandwiching both the input electrode (12) and the output electrode (13). The input electrode (12) includes a plurality of electrode fingers (121 and 122). Each of the electrode fingers (121 and 122) is partially bent at an angle and includes two linear sections (121a and 121b,122a and 122b), respectively. The two linear sections are spaced at a distance of lambda /2 from one another in the propagating direction of the SAWs. As a result, the electrode or IDT has stepped electrode fingers in staggered sections. Electrode fingers (131 and 132) of the output electrode (13) and electrode fingers (141) of the reflector (14) are structured similarly to those of the input electrode (12). <IMAGE>
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