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:
Dec. 25, 2001
Filed:
May. 18, 1999
Olov Edvardsson, Täby, SE;
Richard Bohannan, Långås, SE;
Per Norén, Västra Frölunda, SE;
Gianni Barone, Rome, IT;
Allgon AB, Akersbergs, SE;
Abstract
An antenna system including an antenna device and feed device for transmitting and receiving circularly polarized RF waves in a first mode of operation, and of linearly polarized RF waves in a second mode of operation, and a hand-held mobile communication device provided with such an antenna system. A radiating structure (,) including N helical radiating elements (,A-D), being coextending and coaxially arranged on a support structure (,) are fed in order to provide for transmission/reception of circularly polarized RF waves in the first mode of operation. N is an integer greater than one. Further, means (,A-D,,A) are arranged for essentially uniform excitation of the helical radiating elements (,A-D) in order to provide for transmission/reception of linearly polarized RF waves in the second mode of operation.