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. 07, 2009
Filed:
Apr. 16, 2004
Fusao Sekiguchi, Tokyo, JP;
Kenichi Mitsugi, Tokyo, JP;
Fusao Sekiguchi, Tokyo, JP;
Kenichi Mitsugi, Tokyo, JP;
Yokowo Co., Ltd., Tokyo, JP;
Abstract
A variable tuning antenna includes a tuning circuit () and a radiation element (), connected to each other in series. The tuning circuit () includes a first inductance element () and a parallel circuit () to each other in series, and the parallel circuit () includes a second inductance element () and a variable capacitance element () to each other in parallel. And the tuning circuit is set so that the combined reactance of the radiation element and the first inductance element and the combined reactance of the parallel circuit can be canceled by each other, and the parallel circuit does not resonate in a desired receiving frequency band, and moreover, the tuning circuit is formed so as to be tunable in the desired frequency band by varying the capacitance of the variable capacitance. As a result, the variable tuning antenna can be obtained which is applicable to, for example, a portable telephone and is tunable in a whole range of a wide range of a low frequency band such as that of a digital TV. And a portable wireless device using the antenna is also obtained.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile