Electrical apparatus

H - Electricity – 01 – Q

Patent

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H01Q 3/44 (2006.01)

Patent

CA 2307768

A beam steerer (10) for steering a microwave beam (27) comprises a body (12) of magnetic material having an aperture (15) and magnetic coils (24, 26) for applying a gradient of magnetisation across the aperture (15). Tapered slots extending from the magnetic coils (24, 26) towards a central region of the aperture (15) are filled with a material (32, 34) having a lower magnetic permeability than the magnetic material of the body (12). Lower reluctance paths available through the central region of the aperture (15) allow more magnetic flux from the magnetic coils (24, 26) to penetrate through the central region than would be the case in a body of uniform material composition.

L'invention concerne un dispositif (10) directeur de faisceau servant à diriger un faisceau (27) de micro-ondes, qui comporte un corps (12) en matière magnétique présentant une ouverture (15) et des bobines (24, 26) magnétiques servant à appliquer un gradient de magnétisation à travers l'ouverture (15). Des fentes coniques s'étendant à partir des bobines (24, 26) magnétiques en direction d'une zone centrale de l'ouverture (15) sont remplies d'une matière (32, 34) présentant une perméabilité magnétique inférieure à celle de la matière magnétique constituant le corps (12). Des trajets à faible réluctance passant par la zone centrale de l'ouverture (15) permettent à davantage de flux magnétique provenant des bobines (24, 26) magnétiques de pénétrer par la zone centrale, que ne le permettrait un corps à composition uniforme de matière.

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