| 摘要 |
PROBLEM TO BE SOLVED: To prevent the insertion loss of a surface acoustic wave filter device from becoming markedly worse and to improve the attenuation quantity outside the band. SOLUTION: A surface acoustic wave A excited by an input-side converter 2, having electrode fingers 6 and 7 obliquely to a positive electrode 5 or negative electrode 6 is made incident obliquely on the surface of a converter finger 9. The incident surface acoustic wave A is reflected by the converter 3 and made incident on the opening part of an output-side converter 4 having electrode fingers 12 and 13 obliquely to a positive electrode 10 or negative electrode 11. At this time, the surface acoustic wave has its direction changed by an angleθ1.
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