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:
May. 25, 2004
Filed:
Aug. 21, 2002
Applicant:
Inventor:
Juha Ellä, Halikko, FI;
Assignee:
Nokia Corporation, Espoo, FI;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H 9/00 ;
U.S. Cl.
CPC ...
H03H 9/00 ;
Abstract
A filter structure ( ) comprises a filter section ( ) having at least two branches ( ) connected in parallel. A first branch ( ) of said at least two branches comprises a first plurality ( ) of piezoelectric resonators connected in series, and a second branch ( ) of said at least two branches comprises a second plurality ( ) of piezoelectric resonators and phase shifting means ( ) connected in series. The phase shifting means are arranged to provide a phase shift of substantially 180 degrees.