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EP-0975048-A2-20000126
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"EP0975048"; "EP 0975048"; "H01Q 19/17"; "H01Q 19/02"; "H01Q 19/19"; "Method for reducing cross-polar degradation in multi-feed dual offset reflector antennas"
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EP-0975048-A2-20000126
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A unique feed structure for improving the cross-polarization performance of a reflector antenna system (10) is disclosed. According to the present invention, the feed structure is an array (22) including a number of feeds (40, 45, 55, 60, 65, 70, 75, 80), which are rotated in a predetermined fashion to yield superior cross polarization performance of the antenna system. The array feed (50) in the center of the feed structure is positioned approximately in the focus of the antenna reflector (18). The array feeds located on the y-axis (40, 45, 55, 60) are slightly rotated in either a clockwise or a counterclockwise manner. The magnitude of the rotation is proportional to the distance of the feeds (40, 45, 50, 60) from the x-axis along the y-axis. The rotation of the feeds (40, 45, 55, 60) yields significant performance in cross polarization performance, while having little or no co-polarization effect. [image]
A unique feed structure for improving the cross-polarization performance of a reflector antenna system (10) is disclosed. According to the present invention, the feed structure is an array (22) including a number of feeds (40, 45, 55, 60, 65, 70, 75, 80), which are rotated in a predetermined fashion to yield superior cross polarization performance of the antenna system. The array feed (50) in the center of the feed structure is positioned approximately in the focus of the antenna reflector (18). The array feeds located on the y-axis (40, 45, 55, 60) are slightly rotated in either a clockwise or a counterclockwise manner. The magnitude of the rotation is proportional to the distance of the feeds (40, 45, 50, 60) from the x-axis along the y-axis. The rotation of the feeds (40, 45, 55, 60) yields significant performance in cross polarization performance, while having little or no co-polarization effect. [image]
en
European Patent Office
EP0975048
EP 0975048
H01Q 19/17
H01Q 19/02
H01Q 19/19
Method for reducing cross-polar degradation in multi-feed dual offset reflector antennas
Method for reducing cross-polar degradation in multi-feed dual offset reflector antennas - European Patent Office - EP 0975048 A2
Method for reducing cross-polar degradation in multi-feed dual offset reflector antennas - European Patent Office - EP 0975048 A2
EUROPEAN PATENT APPLICATION
14
EP
0975048
A2
2000-01-26
99114010.4
1999-07-19
US
119301
1998-07-20
H01Q 19/17 A
H01Q 19/02 B
H01Q 19/19 B
Hughes Electronics Corporation
Ramanujam, Parthasarathy
Law, Philip H.
Fermelia, Louis R.
Lindner, Michael, Dipl.-Ing. et al
Method for reducing cross-polar degradation in multi-feed dual offset reflector antennas
Verfahren zur Reduzierung von Kreuzpolarisationsdegeneration in offset gespeisten, dual Reflektorantennen mit Multi-Speisung
Method for reducing cross-polar degradation in multi-feed dual offset reflector antennas
Procédé pour la réduction la dégradation de la polarisation croisée dans antennes à deux surfaces réfléchissantes excentrées avec sources multiple
A unique feed structure for improving the cross-polarization performance of a reflector antenna system (10) is disclosed. According to the present invention, the feed structure is an array (22) including a number of feeds (40, 45, 55, 60, 65, 70, 75, 80), which are rotated in a predetermined fashion to yield superior cross polarization performance of the antenna system. The array feed (50) in the center of the feed structure is positioned approximately in the focus of the antenna reflector (18). The array feeds located on the y-axis (40, 45, 55, 60) are slightly rotated in either a clockwise or a counterclockwise manner. The magnitude of the rotation is proportional to the distance of the feeds (40, 45, 50, 60) from the x-axis along the y-axis. The rotation of the feeds (40, 45, 55, 60) yields significant performance in cross polarization performance, while having little or no co-polarization effect. [image]
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