Multiple loop antenna

H - Electricity – 01 – Q

Patent

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Details

H01Q 11/12 (2006.01) G08B 13/14 (2006.01) G08B 13/24 (2006.01) H01Q 7/00 (2006.01)

Patent

CA 2276412

A multiple loop antenna (30) is provided which may be connected to either a transmit circuit (64), a receive circuit, or a transmit/receive circuit. When powered by the transmit circuit, the antenna generates radio frequency magnetic fields in an area or zone proximate to the antenna, but which are substantially canceled at a distance approximately one wavelength and more from the antenna, thereby defining a surveillance zone proximate to the antenna. Radiating loop segments (36, 38) of the antenna are centered around a common feed point and are geometrically symmetrical, such that currents are precisely controlled in each loop segment.

L'invention concerne une antenne à boucles multiples (30), qui peut être connectée à un circuit émetteur (64), à un circuit récepteur ou à un circuit émetteur/récepteur. Quand elle est alimentée par le circuit émetteur, l'antenne génère des champs magnétiques RF dans une aire ou une zone qui est proche d'elle, mais qui est sensiblement supprimée à une distance éloignée approximativement d'une longueur d'onde ou plus de l'antenne, ce qui définit une zone de surveillance proche de cette dernière. Des segments de boucle rayonnante (36, 38) de l'antenne sont centrés autour d'un point d'alimentation commun et sont géométriquement symétriques, de façon à commander avec précision les courants dans chaque segment.

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