Communications: radio wave antennas – Antennas – Wave guide type
Patent
1996-09-26
2000-02-01
Le, Hoanganh
Communications: radio wave antennas
Antennas
Wave guide type
343840, 343781P, H01Q 1919
Patent
active
060208597
ABSTRACT:
The present invention provides a reflector antenna which has dual polarization with low cross polarization within the main lobe and side lobes of the radiation pattern. The antenna includes a dish-shaped main reflector with a center located, self-supporting tubular feed element and a sub-reflector mounted on the free end of the tube and located at the focal area of the main reflector. The tube and sub-reflector are separated by a space which can be open or filled with a dielectric material. The diameter of the sub-reflector is greater than the tube. The surface of the sub-reflector facing the main reflector includes one or more concentric circular corrugations which can be filled with a dielectric material.
REFERENCES:
patent: 3162858 (1964-12-01), Cutler
patent: 4963878 (1990-10-01), Kildal
patent: 5451972 (1995-09-01), Franklin
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