A small helical antenna with non-directional radiation pattern

H - Electricity – 01 – Q

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H01Q 1/36 (2006.01) H01Q 9/30 (2006.01) H01Q 11/08 (2006.01)

Patent

CA 2232064

A small helical antenna with broad fan radiation pattern provides easy impedance matching and high radiation efficiency. It is composed of a dielectric cylinder, a plurality of radiation conductors arranged on the outer surface of the dielectric cylinder, a matching conductor arranged on the upper inner surface of the dielectric cylinder that cancels inductive reactance, and a plurality of feeder conductors arranged near the radiation conductors on the lower inner surface of the dielectric cylinder and lowering the impedance of the helical antenna.

Petite antenne hélicoïdale avec motif de rayonnement en forme de large éventail, pour faciliter son adaptation d'impédance et lui donner une grande efficacité de rayonnement. L'antenne est constituée d'un cylindre diélectrique, d'une série de conducteurs de rayonnement disposés sur la surface extérieure du cylindre, un conducteur d'adaptation étant placé sur la surface interne supérieure du cylindre pour annuler la réactance inductive, tandis qu'un certain nombre de conducteurs d'alimentation, disposés sur la surface interne inférieure du cylindre diélectrique, près des conducteurs de rayonnement, servent à abaisser l'impédance de l'antenne hélicoïdale.

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