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. 14, 2006
Filed:
Nov. 01, 2004
Kazuhisa Yamaki, Kanazawa, JP;
Kazuhisa Yamaki, Kanazawa, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
An antenna structure includes a capacitance-rendering portion located between an open end portion of a feed radiation electrode and a ground portion. A switch for changing the capacitance between the open end portion of the feed radiation electrode and the ground portion rendered by the capacitance-rendering portion is provided. When the capacitance between the open end portion of the feed radiation electrode and the ground portion is increased by the capacitance-rendering portion, a resonant frequency in the fundamental frequency band, caused by the antenna operation of the feed radiation electrode, is reduced corresponding to the increased amount of the capacitance. When the capacitance between the open end portion of the feed radiation electrode and the ground portion is decreased by the changing operation of the capacitance-rendering portion, the resonant frequency in the fundamental frequency band is increased corresponding to the decreased amount of the capacitance.