| (19) |
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(11) |
EP 0 139 482 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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16.07.1986 Bulletin 1986/29 |
| (43) |
Date of publication A2: |
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02.05.1985 Bulletin 1985/18 |
| (22) |
Date of filing: 21.09.1984 |
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| (84) |
Designated Contracting States: |
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DE FR GB |
| (30) |
Priority: |
22.09.1983 GB 8325386
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| (71) |
Applicant: BRITISH AEROSPACE PUBLIC LIMITED COMPANY |
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() |
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| (72) |
Inventor: |
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- Hall, William John British Aerospace P.L.C.
()
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| (54) |
Scanning dual reflector antenna |
(57) An antenna system, on a spacecraft for example, comprises a movable reflector dish
so that the antenna pointing direction can be varied or scanned and a fixed feed.
To reduce separation of the feed from the focal point of the dish during such scanning,
the feed is positioned at the point about which the dish is movable and is directed
towards a convex auxiliary dish fixed to and movable with the main dish and producing
a virtual image of the feed at the focal point of the main dish.