2016-08-242016-08-242006-04-11http://hdl.handle.net/10919/72524Wideband antennas with omnidirectional coverage have both military and commercial applications. In one embodiment, the Planar Inverted Cone Antenna (PICA) is composed of a single flat element vertically mounted above a ground plane. A geometry of Planar Inverted Cone Antenna (PICA) is based on the conventional circular-disc antenna with trimmed top part having the shape of a planar-inverted cone. in a second embodiment, the Fourpoint antenna also provides balanced impedance over the operating band and has useful radiation patterns and dual polarization over its operating frequency.application/pdfen-USPatenthttp://pimg-fpiw.uspto.gov/fdd/02/270/070/0.pdf10960488343/773343/846H01Q21/26H01Q1/38H01Q9/28H01Q9/407027002