Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Patent
1995-11-08
1997-09-30
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
343781GA, H01Q 1919
Patent
active
056730578
ABSTRACT:
A beam waveguide type dual reflector (3, 4) type antenna, referred to as a Cassegrain antenna, is constructed with a beam waveguide (5, 6, 9, 11, 13, 15), having three axes of rotation (X1, Y1, & Z1), the first (X1) and second axes (Y1) of rotation being perpendicular to each other and the second (Y1) and third (Z1) axes of rotation being perpendicular to each other and with the spacing between the first (X1) and third (Z1) axes being constant to achieve a greater field of view, while retaining the capability of handling simultaneously cross polarized microwave signals. Actuator singularities, defining forbidden regions, singularity associated with rotation about the first and second axes are avoided by switching to rotation about the first and third axes as the singularity is approached by the antenna, permitting the antenna to move through that singularity region.
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B. Claydon, "Beam Waveguide Feed for a Satellite Earth Station Antenna", The Marconi Review, vol. 34 #201 pp. 81-116.
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Hughes William M.
Johnson Dan R.
Toland Brent T.
Goldman Ronald M.
Le Hoanganh T.
TRW Inc.
Yatsko Michael S.
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