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:
Jun. 12, 2012
Filed:
Jan. 27, 2009
Kenichi Ishizuka, Yokohama, JP;
Kazunari Kawahata, Yokohama, JP;
Nobuhito Tsubaki, Sagamihara, JP;
Murata Manufactruing Co., Ltd., Kyoto, JP;
Abstract
An antenna device capable of not only achieving multiple resonances and wideband characteristics but also achieving improvement of antenna efficiency and accurate matching at all resonant frequencies, and a wireless communication apparatus. In one example, an antenna deviceincludes a radiation electrodeto which power is capacitively fed through a capacitor portion C, and additional radiation electrodes-to-branched from the radiation electrode. A distal end portionof the radiation electrodeis grounded to a ground region, and is a portion at which a minimum voltage is obtained when power is fed. A capacitor portion Cthat is a portion at which a maximum voltage is obtained when power is fed is disposed in a proximal end portionof the radiation electrode, and a variable capacitance elementwhich is grounded is connected in series with the capacitor portion C. The additional radiation electrodes-to-are connected to the radiation electrodethrough switch elementsto, and include reactance circuits-to-in a middle thereof. Distal end portions of the additional radiation electrodes-to-are grounded to the ground region