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. 24, 2007
Filed:
Jan. 20, 2006
Dou Yuanzhu, Fukushima-ken, JP;
Dou Yuanzhu, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
In an antenna device, a radiation slot formed in a metal plate includes a main slot part on one diagonal line of the metal plate and first and second branch slot parts. The first and second branch split parts extend along two adjacent sides of the metal plate and are connected to one end of the main slot part. A power feeder line and a ground line are formed in the vicinity of another end of the main slot part. The length and relative position of each slot part is set such that the plane of polarization of an electric wave radiated from the main and first slot parts and the plane of polarization of an electric wave radiated from the main and second slot parts are orthogonal to each other and the two electric waves differ in phase by 90 degrees.