A method of producing a helical antenna capable of covering...

H - Electricity – 01 – Q

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Details

H01Q 11/08 (2006.01) H01Q 1/38 (2006.01) H01Q 5/00 (2006.01)

Patent

CA 2253035

The invention provides a helical antenna capable of covering a plurality of frequency bands and using commonly a feeder system for antenna elements adjusted to the respective frequency bands. First and second antenna elements adjusted in length to wavelengths of the frequency bands to be used are arranged helically at a specified pitch angle with a spacing between each other in the circumferential direction of a cylindrical body on the surface of a dielectric sheet wound around the outer circumferential surface of said cylindrical body. Coupling lines to be electromagnetically coupled to one-side ends of the antenna elements being adjacent to one another are formed on the surface of the dielectric sheet. Signal is fed from a common feeder circuit through the coupling lines to the respective antenna elements.

L'invention est une antenne hélicoïdale qui peut couvrir une pluralité de bandes de fréquences, dont les éléments utilisent un système d'alimentation commun ajusté selon leurs bandes de fréquences individuelles. Le premier et le second élément de l'antenne sont ajustés en longueur aux longueurs d'onde correspondant aux bandes de fréquences à utiliser et sont montés hélicoïdalement à un angle de pas donné avec un espacement entre eux dans le sens circonférentiel d'un corps cylindrique à la surface d'une feuille diélectrique enveloppant la surface circonférentielle externe de ce corps cylindrique. Les lignes de couplage qui doivent être couplées électromagnétiquement à l'une des extrémités des éléments d'antenne sont adjacentes et sont formées à la surface de la feuille diélectrique. Le signal est transmis du circuit d'alimentation commun aux éléments d'antenne respectifs par l'intermédiaire des lignes de couplage.

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