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. 28, 2010
Filed:
May. 23, 2006
Teruhisa Shibahara, Kyoto, JP;
Teruhisa Shibahara, Kyoto, JP;
Murata Manufacturing Co., Ltd, Kyoto, JP;
Abstract
An acoustic wave filter device having a balanced-to-unbalanced conversion function, in which the signal balance between a pair of balanced terminals is improved, has, on a piezoelectric substrate, one end of at least one longitudinally coupled resonator type acoustic wave filter and one end of at least one second longitudinally coupled resonator type acoustic wave filter among the rest of acoustic wave filters are commonly connected and connected to an unbalanced terminal, and the other ends of the longitudinally coupled resonator type acoustic wave filters are electrically connected to first and second balanced terminals, respectively, and in which a propagation direction of an acoustic wave in the longitudinally coupled resonator type acoustic wave filter and a propagation direction of an acoustic wave in the second longitudinally coupled resonator type acoustic filter are different from each other.