The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 2004
Filed:
Jan. 14, 2003
TDK Corporation, Tokyo, JP;
Abstract
The surface acoustic wave device comprises a piezoelectric substrate ( ) and a pair of interdigitated electrodes ( ) provided on one main surface of the piezoelectric substrate ( ). As the material of the piezoelectric substrate ( ), a single crystal belonging to the point group having a crystal structure of Ca Ga Ge O type, containing Ca, Nb, Ga, Si and O as main components, and being represented by the chemical formula Ca NbGa Si O is used. The cut angle of the substrate ( ) and the propagation direction can be selected as appropriate to thereby realize the substrate ( ) which has a large electromechanical coupling coefficient that is effective to achieve a wider passband and a low SAW velocity that is effective to reduce the size of a surface acoustic wave device.