Antenna element for two orthogonal polarizations

H - Electricity – 01 – Q

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H01Q 9/04 (2006.01)

Patent

CA 2219925

An antenna element intended for transmission and reception of orthogonal polarisations having a good polarisation purity of electromagnetic radiation is described. It comprises a ground plane and at least one radiation disc connected to two ports for the supply of a desired electromagnetic radiation, preferably in the microwave range. The distance between the ground plane and the radiation disc is a fraction of the wavelength .lambda. of the radiation. The antenna element is in particular characterized in that the ports are located at an electric distance of 90° from each other and that a quarterwave transformer is added between the ground plane and the radiation disc that is shaped so that the transmission line impedance between the ports is reduced in order to make the ports radiationally independent of each other.

La présente invention concerne un élément d'antenne conçu pour l'émission et la réception de polarisations orthogonales avec une bonne pureté de polarisation du rayonnement électromagnétique. L'élément comprend un plan de sol (2) et au moins un disque de rayonnement (1) connectés à deux orifices (4, 5) fournissant un rayonnement électromagnétique, de préférence dans la gamme des micro-ondes. La distance entre le plan de sol (2) et le disque de rayonnement (1) est une fraction de la longueur d'onde lambda du rayonnement. Cet élément d'antenne est notamment caractérisé par une position des orifices (4, 5) comportant entre eux un écart électrique de 90 DEG , et l'adjonction d'un transformateur quart-d'onde (6) entre le plan de sol (2) et le disque de rayonnement (1), lequel transformateur est configuré de façon que l'impédance propre à la ligne de transmission entre les orifices (4, 5) est réduite, ce qui permet de rendre les orifices indépendants l'un de l'autre en matière de rayonnement.

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