Elastic wave device
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United States of America Patent
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Sep 1, 2015
Grant Date -
Nov 8, 2012
app pub date -
Dec 14, 2011
filing date -
Dec 16, 2010
priority date (Note) -
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Abstract
An elastic wave device includes a piezoelectric substrate, an IDT electrode disposed on the piezoelectric substrate, a wiring electrode disposed on the piezoelectric substrate and connected to the IDT electrode, a first insulator disposed on the piezoelectric substrate to seal the IDT electrode and the wiring electrode, a resin layer provided on the first insulator, an inductor electrode disposed on the resin layer, a second insulator disposed on the resin layer to cover the inductor electrode, a terminal electrode disposed on the second insulator, and a connecting electrode passing through the first insulator, the second insulator, and the resin layer to electrically connect the wiring electrode, the terminal electrode, and the inductor electrode. The first insulator includes a resin and filler dispersed in the resin. A density of filler in the resin layer is smaller than an average density of the filler in the first insulator. This elastic wave device has excellent characteristics of the inductor while reducing variations of the characteristics.
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