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:
Oct. 18, 2011
Filed:
Jun. 09, 2009
Koichi Hatano, Yokohama, JP;
Jun Tsutsumi, Kawasaki, JP;
Koichi Hatano, Yokohama, JP;
Jun Tsutsumi, Kawasaki, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
A duplexer includes a substrate including an insulation layer, an upper interconnection layer provided on an upper surface of the insulation layer, a lower interconnection layer provided on a lower surface of the insulation layer, and an inner interconnection layer provided in the insulation layer, the inner interconnection layer including an inner ground pad, at least one acoustic wave filter chip mounted on an upper surface of the substrate, signal pads provided on the upper interconnection layer and connected to signal electrodes of the at least one acoustic wave filter chip, and an upper ground pad that is provided in the upper interconnection layer so as to be located between the signal pads and is connected to a ground electrode of the at least one acoustic wave filter, wherein DDand DTwhere Dis a minimum distance between the signal pads and the upper ground pad, Dis a minimum distance between the signal pads and the inner ground pad, and Tis a thickness of the insulation layer between the upper interconnection layer and the inner interconnection layer.