Optimized rf-transparent antenna sunshield membrane

H - Electricity – 01 – Q

Patent

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Details

H01Q 1/40 (2006.01) H01Q 1/00 (2006.01) H01Q 1/42 (2006.01) H01Q 15/14 (2006.01)

Patent

CA 2089778

An RF-transparent sunshield membrane covers an antenna reflector such as a parabolic dish. The membrane includes a single dielectric sheet of polyimide film 1 mil thick. The surface of the film facing away from the reflector is coated with an electrically semiconductive coating such as vapor-deposited germanium having a thickness in the range of 200 .ANG. to 600 .ANG.. In another embodiment of the invention, the surface of the film facing the reflector may be reinforced by an adhesively attached polyester or glass fiber mesh.

L'invention est constituée par une membrane de protection contre le soleil transparente aux radiofréquences qui est placée sur le réflecteur d'une antenne telle qu'une antenne parabolique. Cette membrane comprend une seule couche diélectrique de film de polyimide d'une épaisseur de 1 mil. La surface du film qui se trouve du côté opposé au réflecteur porte une couche électriquement semi-conductrice d'une substance telle que le germanium déposé en phase vapeur qui a une épaisseur allant de 200 Ao à 600 Ao. Dans une autre concrétisation de l'invention, la surface du film qui fait face au réflecteur peut être renforcée par une toile de polyester ou de fibre de verre collée.

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