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:
Mar. 11, 2003
Filed:
Apr. 13, 2001
Tetsuya Saito, Saitama, JP;
NEC Corporation, Tokyo, JP;
Abstract
A retractable/extendable antenna for portable radio device is provided, which expands the bandwidth for the operating frequency of 1.5 GHz. This antenna comprises (a) a casing; (b) a first linear antenna element attached retractably or extendably to the casing; the first element being located outside the casing and fed with electric power to be active in the extended state while located inside the casing and fed with no electric power to be inactive in the retracted state; and (c) a second linear antenna element shorter than the first element, which is connected mechanically to one end of the first element and disconnected electrically therefrom; the second element being located outside the casing and fed with no electric power to be inactive in the extended state while located outside the casing and fed with electric power to be active in the retracted state. The first and second elements may be electrically connected to each other.