Communications: radio wave antennas – Antennas – Wave guide type
Reexamination Certificate
2000-02-04
2001-06-05
Wimer, Michael C. (Department: 2821)
Communications: radio wave antennas
Antennas
Wave guide type
C343S7810CA
Reexamination Certificate
active
06243048
ABSTRACT:
BACKGROUND
The present invention relates generally to Gregorian reflector antenna systems, and more particularly, to a Gregorian reflector antenna system having a subreflector optimized for an elliptical antenna aperture.
The assignee of the present invention deploys communication satellites containing communications systems. Gregorian reflector antenna systems are typically used on such communication satellites. Previously deployed Gregorian reflector antenna systems have not used a subreflector having a surface that is optimized when the aperture produced by the main reflector is an ellipse.
Accordingly, it is an objective of the present invention to provide for a Gregorian reflector antenna system having a subreflector optimized for an elliptical antenna aperture.
SUMMARY OF THE INVENTION
To accomplish the above and other objectives. the present invention provides for an improved Gregorian reflector antenna system. The Gregorian reflector antenna system comprises a main reflector, a subreflector, and a feed horn for illuminating the subreflector.
The subreflector illuminates the main reflector with an elliptically shaped feed cone of energy. The subreflector has a surface defined by the equation
x
2
a
2
+
y
2
b
2
+
z
2
c
2
=
1
,
where x, y, and z are three axes of the Cartesian coordinate system as shown in FIG.
5
. The terms a, b, and c are three parameters of the surface of the subreflector.
The present Gregorian reflector antenna system has improved performance compared with conventional Gregorian reflector antenna systems that are not optimized for the shape of the antenna aperture. The Gregorian reflector antenna system is intended for use on an LS20.20 satellite developed by the assignee of the present invention.
REFERENCES:
patent: 5684494 (1997-11-01), Nathrath et al.
Float Kenneth W.
Space Systems Loral, Inc.
Wimer Michael C.
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