Patent 7825873 was granted and assigned to Radiall on November, 2010 by the United States Patent and Trademark Office.
The present invention relates to an antenna comprising:at least one central longitudinal radiating element; andat least one outer element comprising at least one rolled-up electrically-conductive sheet disposed around the central element, without electrical contact therebetween, the outer element presenting a height that is strictly decreasing, or alternatively that increases and decreases along the roll.