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:
Nov. 20, 2007
Filed:
Aug. 04, 2006
Isao Ohba, Tokyo, JP;
Isao Ohba, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An antenna device and a radio apparatus are provided. The antenna device is configured to be coupled to a feeding point of the radio apparatus. The antenna device has a first antenna element and a second antenna element. The first antenna element is configured to be an unbalanced-fed antenna fed at the feeding point to resonate at a first frequency. The second antenna element is configured to be a monopole antenna having an open end and to be fed at the feeding point. The first antenna element and the second antenna element have a common portion from the feeding point to a branching point. The second antenna element is configured to be ungrounded in a first state to resonate at a second frequency lower than the first frequency and to be grounded in a second state at a switch point between the branching point and the open end.