Ultra-broadband linearly polarized biconical antenna

Claim 1

A broadband linearly polarized biconical antenna having, in combination, a pair of biconically disposed conductive cone elements with adjacent apex regions connected to out-of-phase terminals of a feed transmission line and spaced from one another by an insulating spacer; conductive sleeve means surrounding said spacer, capacitively coupling said cone elements, and providing reactance for the antenna so as to affect voltage standing wave ratios of the antenna over at least a portion of a broad band of frequencies; each cone element having crown means, including a zig-zag arrangement of conductive spokes that conically diverges from the periphery of a base of the cone element, for providing a plurality of V-shaped conductors that act inductively and that define a plurality of inter-spoke gaps that act capacitively, so as to provide a frequency-dependent antenna current distribution and an antenna impedance that increases with increasing frequency in said band, and so as to cause the antenna current density to be restricted to the center of the antenna at higher frequencies of said band and to be forced to a substantially cosine distribution at lower frequencies of said band.