Communications: radio wave antennas – Antennas – Wave guide type
Patent
1991-02-14
1993-01-26
Hille, Rolf
Communications: radio wave antennas
Antennas
Wave guide type
343840, 343912, H01Q 1919, H01Q 1516, H01Q 112
Patent
active
051825694
ABSTRACT:
A microwave antenna has a circularly symmetrical reflector made of a material having a liquid phase and a solid phase, with the reflector being obtained by centrifuging the material while in its liquid phase and then allowing it to pass into its solid phase. This results in a convex paraboloidal reflector face having a very high degree of surface accuracy. When housed inside a microwave absorbing ring connecting the reflector face to a microwave-transparent window and used with a suitable source held at a predetermined focus position between the reflector and the window by means of microwave absorbent triangular struts, the antenna demonstrates improved radio and mechanical properties. Alternately, the centrifugally cast convex paraboloidal reflector may be used as the main reflector in a hybrid Cassegrain optical system in which the subreflector has a "conformed" non-paraboloidal surface that is machined from a solid piece of material. This results in an antenna that is easy to manufacture, and yet has much of the improved radio performance associated with the use of "conformed" surfaces for both reflectors. By also using a "conformed" lens at the aperture of the source, performance of such a hybrid system is further enhanced.
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ALCATEL N.V.
Brown Peter Toby
Hille Rolf
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