SUPPRESSION OF TRANSVERSE MODE SPURIOUS SIGNALS IN SURFACE ACOUSTIC WAVE DEVICES UTILIZING A DENSE FILM ABOVE GAP REGION OF INTERDIGITAL TRANSDUCER ELECTRODES

摘要

An acoustic wave device comprises a substrate including a piezoelectric material, interdigital transducer (IDT) electrodes disposed on a surface of the substrate, the IDT electrodes having gap regions, edge regions, and center regions, a first dielectric film having a lower surface disposed on the IDT electrodes and the surface of the substrate, and a material having a density greater than a density of the first dielectric film disposed above the gap regions of the IDT electrodes.