Patent ID: 9035725
Filing Date: 2015-05-19
Classification: H03H

Abstract:
1. An acoustic wave device comprising: a piezoelectric substrate; an interdigital transducer (IDT) electrode provided on an upper surface of the piezoelectric substrate, the IDT electrode being configured to excite an acoustic wave propagating in a predetermined propagation direction; a first dielectric film covering the upper surface of the piezoelectric substrate to cover the IDT electrode; and a second dielectric film covering an upper surface of the first dielectric film, wherein the IDT electrode includes a first comb electrode and a second comb electrode facing each other, wherein the first comb electrode includes a first bus bar and a plurality of first electrode fingers extending from the first bus bar toward the second comb electrode, wherein the second comb electrode includes a second bus bar and a plurality of second electrode fingers extending from the second bus bar toward the first comb electrode, such that the plurality of second electrode fingers interdigitate with the plurality of first electrode fingers, wherein each of the plurality of first electrode fingers includes a first tip portion facing the second bus bar, wherein each of the plurality of second electrode fingers includes a second tip portion facing the first bus bar, wherein the IDT electrode defines: wherein the second dielectric film includes: