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:
Sep. 15, 2009
Filed:
Oct. 20, 2005
Veit Meister, Kagel, DE;
Urlike Rösler, Hebertshausen, DE;
Werner Ruile, Munich, DE;
EPCOS AG, Munich, DE;
Abstract
A surface acoustic wave component includes a piezoelectric substrate and an electrode structure that includes multiple layers and that is on the piezoelectric substrate. A dielectric layer is above the electrode structure. The dielectric layer has an acoustic impedance Z. The multiple layers include a first layer system that includes at least one first layer made of a first material, which has an acoustic impedance that is less than 2Z. The second layer system includes at least one second layer made of a second material, which has an acoustic impedance that exceeds 2Z. The second layer system has a height that is between 15% and 85% of a total height of the multiple layers.