Helical antenna having adjustable beam angle

H - Electricity – 01 – Q

Patent

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Details

H01Q 11/08 (2006.01)

Patent

CA 2196670

A quadrifilar helical antenna including four conductive helices having a common central axis, a common direction of turn about said axis, a common pitch, and a common length between opposite ends, the helices being uniformly spaced from each other by 90~, and a single dielectric helix concentric with the common axis, lying within and supporting the conductive helices at a nominal diameter. The dielectric helix has opposite ends, a plurality of turns having said common direction of turn, and a second pitch substantially greater than said common pitch. A casing contains the helices and is rotatably fixed to one end of the dielectric helix. A tuning device is fixed to the other end of the dielectric helix and rotatable relative to said casing, so that rotation of the tuning device twists the dielectric helix to alter the common pitch of the conductive helices without substantial variation from said nominal diameter.

L'invention concerne une antenne quadrifilaire comprenant quatre hélices conductrices ayant un axe central commun, une direction commune des spires autour dudit axe, un pas commun et une longueur commune entre les extrémités opposées, les hélices étant espacées uniformément l'une de l'autre de 90~. Une seule hélice diélectrique concentrique (ayant le même axe) se trouve à l'intérieur des hélices conductrices qu'elle supporte, à un diamètre nominal. L'hélice diélectrique a des extrémités opposées, une pluralité de spires ayant ladite direction commune des spires et un second pas sensiblement supérieur audit pas commun. Une enveloppe renfermant les hélices est montée en rotation à une extrémité de l'hélice diélectrique. Un dispositif d'accord est fixé à l'autre extrémité de l'hélice diélectrique et il peut tourner par rapport à ladite enveloppe, de sorte que la rotation du dispositif d'accord provoque une torsion de l'hélice diélectrique pour modifier le pas commun des hélices conductrices, sans qu'il y ait de variation sensible par rapport au diamètre nominal.

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