Patent ID: 6534895
Filing Date: 2003-03-18
Classification: H03H

Abstract:
A surface acoustic wave device comprising:a substrate; an electrode disposed on the substrate, having a specific resistance of up to about 1 &OHgr;Â·cm, and including a ZnO layer with a low resistance, having an impurity doping the ZnO; a piezoelectric film arranged as an epitaxial film on the electrode including the ZnO layer, and having a specific resistance of at least about 106 &OHgr;Â·cm and a lattice constant within approximately Â±20% of that of ZnO; and an interdigital electrode disposed on the piezoelectric film; wherein the substrate is made of a material selected from the group consisting of R-plane sapphire, c-plane sapphire, sapphire having a plane parallel to a c axis, (111), (100) or (011) silicon, Z-cut quartz, approximately 30Â° to approximately 42Â° rotated Y-plate LiNbO3, and approximately 30Â° to approximately 42Â° rotated Y-plate LiTaO3.