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:
Jan. 25, 2011
Filed:
Dec. 04, 2006
Masaya Tamura, Osaka, JP;
Masaya Tamura, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A composite filter downsized without degrading its characteristics is disclosed. The filter includes a surface acoustic wave filter and an LC filter coupled to the surface acoustic wave filter. The LC filter is formed by combining a π-shaped LC filter formed of two capacitors and an inductor coupled together in a π-shape with a capacitor coupled in parallel to the inductor. The two capacitors of the π-shaped LC filter are placed on a piezoelectric substrate with their comb-shaped electrodes opposed to each other. This opposing direction differs from an opposing direction of comb-shaped electrodes of a surface acoustic wave resonator.