Communications: radio wave antennas – Antennas – With housing or protective covering
Patent
1993-04-22
1994-12-13
Hille, Rolf
Communications: radio wave antennas
Antennas
With housing or protective covering
343909, 343DIG2, H01Q 142, H01Q 128, H01Q 140
Patent
active
053733053
ABSTRACT:
An RF-transparent sunshield membrane covers an antenna reflector such as a parabolic dish. The membrane includes at least two dielectric sheets of polyimide film 1 mil thick. The surface of the outer 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.. A member, such as a glass fiber mat, may be located in the space between the two dielectric sheets for maintaining the sheets in spaced-apart relationship. 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.
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PCT International Search Report for PCT/US93/04681 dated Aug. 24, 1993.
Amore Leo J.
Lepore, Jr. Albert
Marr Susan L.
Wong Hamilton
Berard Jr. Clement A.
Brown Peter Toby
Hille Rolf
Martin Marietta Corporation
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