Acoustic wave device and electronic equipment using the same
AssigneePanasonic Corporation
InventorsRei Goto, Hidekazu Nakanishi, Hiroyuki Nakamura
Life of this patent
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Abstract
An acoustic wave device has: a piezoelectric body; an interdigital electrode that is arranged on the piezoelectric body and excites an acoustic wave; and a dielectric layer that is arranged on the piezoelectric body so as to cover the interdigital electrode. The dielectric layer 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 possible to shift a spurious radiation by a high-order mode that propagates inside the dielectric layer to a higher frequency, so as to reduce an influence of the spurious radiation by the high-order mode.
Claims6
An acoustic wave device, comprising:
- a piezoelectric body;
- an interdigital electrode that is arranged on the piezoelectric body and excites an acoustic wave;
- and
- a dielectric layer that is arranged on the piezoelectric body so as to cover the interdigital electrode,
- wherein the dielectric layer includes a composition changing portion made up of a medium in which propagation velocity of a transverse wave continuously or stepwise increases upward.
Dependencies are inferred from the claim text.