Antenna element, conically helical, for polarization purity...

H - Electricity – 01 – Q

Patent

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H01Q 11/08 (2006.01) H01Q 1/36 (2006.01)

Patent

CA 2224861

An antenna element is described. It comprises a ground plane and a conical support of a dielectric that with its bottom portion is attached to the plane and supports first to fourth radiation means having the shape of helical wires which are symmetrically arranged around and are carried by the support. The radiation means are attached to the ground plane at their exterior lower ends and for transmission they are provided with a microwave signal each at their upper interior portions through a coaxial cable each, so that two orthogonal, preferably circular polarizations are generated by the emitted radiation. The antenna element is particularly characterized by a distribution network arranged to divide, for transmission, the incoming signal in four subsignals which are offset in phase in relation to each other, each one of which being provided to a corresponding one of said first to fourth radiation means, and that adaption means are arranged to adapt the output impedance of the distribution network to the input impedance of the radiation means so that it is substantially independent of the actual microwave frequency used within a relatively wide frequency range.

L'invention porte sur un élément d'antenne comportant une embase (1) et le support conique (2) d'un élément diélectrique qui ainsi que sa base est fixé à l'embase et supporte de 1 à 4 éléments rayonnants filaires en hélice (3 - 6) disposés symétriquement autour du support qui les porte. Les éléments rayonnants, fixés à l'embase par leur extrémités inférieures extérieures, reçoivent chacun en vue de son émission un signal hertzien par leurs parties intérieures supérieures par l'intermédiaire d'un câble coaxial (8, 9) d'où résultent deux polarisations orthogonales de préférence circulaires produites par les ondes émises. Cet élément d'antenne se caractérise en particulier par son réseau de distribution (15) conçu pour diviser, en vue de sa transmission, le signal entrant en quatre sous-signaux décalés en phase les uns par rapport aux autres et dont chacun alimente l'un desdits 1 à 4 éléments rayonnants en hélice (3 - 6), et par des éléments adaptateurs (14) conçus pour adapter l'impédance de sortie du réseau de distribution à l'impédance d'entrée des moyens de rayonnement de sorte qu'elle soit sensiblement indépendante de la fréquence hertzienne instantanée présentant une plage de fréquences relativement étendue.

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