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. 10, 2012
Filed:
Sep. 30, 2008
Hironori Kikuchi, Miyagi, JP;
Kenichi Sato, Miyagi, JP;
Hironori Kikuchi, Miyagi, JP;
Kenichi Sato, Miyagi, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A challenge to be met by the present invention is to provide a radio communication apparatus that enables prevention of a drop in antenna gain, which would otherwise arise when an apparatus main body is placed on a metal plate, such as a metallic desk, at low cost. A second antenna element () is placed at such a position where resonance arises at a frequency band of a first antenna element () and connected to a ground pattern of a circuit board () by way of an antenna grounding unit () connected exclusively to a radio system unit (). Further, a reactance unit () of the antenna grounding unit () performs regulation such that the second antenna element () is electromagnetically coupled with the metal plate, to thus cause resonance at a predetermined frequency, when the apparatus main body is placed on the metal plate and that the resonance frequency becomes a frequency band of the first antenna element (). When the apparatus main body is placed on the metal plate while a radio signal is being transmitted at the frequency band of the first antenna element (), the second antenna element () can thereby be used as a passive element, so that occurrence of a drop in gain of the first antenna element () can be prevented.