Circularly polarized dipole type omnidirectional transmitting antenna

Claim 1

A transmitting antenna for radiation of signals of wavelength λ comprising: a. a coaxial transmission line consisting of an elongated metal tube serving as an outer conductor and a coaxial conductive member coextensive therewith serving as a center conductor, said tube having two side wall portions isolated each from the other by a pair of diametrically opposed slots, each of a length of about λ/2; b. an electrically conductive member joining the said center conductor to one of said side wall portions; a first conductive arm electrically connected to one said side wall portion at approximately the midpoint of the slot and having a length of about λ/4 extending at an angle of from 30° to 60° downward relative to the axis of the said outer conductor said arm extending generally outwardly in an arc from said first side wall; and a second conductive arm electrically connected to the other side wall portion at approximately the midpoint of the slot and having a length of about λ/4 extending at an angle of from 30° to 60° upward relative to the axis; c. a continuous resin bonded electrically non-conductive fiber cover surrounding the said outer conductor; and d. a metal band surrounding said cover and capacitively coupled to the said side walls.