| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress high-order spurious components. Ž<P>SOLUTION: An acoustic wave element 5 has: a piezoelectric body 6; an interdigital electrode 7 that is arranged on the piezoelectric body 6 and excites an acoustic wave; and a dielectric layer 8 that is arranged on the piezoelectric body 6 so as to cover the interdigital electrode 7. The dielectric layer 8 includes a composition changing portion made up of a medium where propagation velocity of a transverse wave continuously increases upward. With this configuration, it is attainable to shift a spurious radiation by a high-order mode that propagates inside the dielectric layer 8 to a higher frequency, to reduce an influence of the spurious radiation by the high-order mode. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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