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:
Jul. 12, 2011
Filed:
Dec. 17, 2009
Applicants:
Werner Ruile, Munich, DE;
Clemens Ruppel, Munich, DE;
Inventors:
Werner Ruile, Munich, DE;
Clemens Ruppel, Munich, DE;
Assignee:
EPCOS AG, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H 9/64 (2006.01); H03H 9/145 (2006.01);
U.S. Cl.
CPC ...
Abstract
A transversal filter operates using surface acoustic waves and has a piezoelectric substrate and an acoustic track that is arranged on the substrate and in which a first transducer and a second transducer are arranged. Each transducer has electrode fingers. A function, which characterizes the weighting of the overlap length of electrode fingers of different polarity in the second transducer, has a half main lobe and at least one side lobe. The amplitude of the lobes decreases monotonally in a direction that points to the first transducer.