HELICAL ANTENNA Russian patent published in 2012 - IPC H01Q11/00 

FIELD: radio engineering.

SUBSTANCE: helical antenna comprises a dielectric frame, a metal screen, a quadruple spiral. The quadruple spiral comprises the first, the second, the third and the fourth turns. The first and second spiral turns are made of coaxial cables. The third and fourth spiral turns are arranged of a conductor of round cross section, at the same time the conductor diametre is equal to the coaxial cable diametre. The dielectric frame comprises ribs and is attached by a wide base to the metal screen. At the side of the wide base of the dielectric frame, the first and second spiral turns via high-frequency connectors are connected to outlet arms of a coaxial T-joint, the third and fourth turns are fixed to the metal screen. High-frequency connectors are fixed to the metal screen. At the side of the narrow base of the dielectric frame, the central conductors of coaxial cables of the first and second turns of the quadruple spiral are connected with opposite conductors of round section in the third and fourth ones.

EFFECT: increased efficiency of a feeder system of a helical antenna without change of its radiation characteristics.

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