Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Patent
1991-03-28
1993-07-20
Hille, Rolf
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
343763, 343882, H01Q 3020, H01Q 1120
Patent
active
052297810
ABSTRACT:
A pointing system for reflector type antennas providing a high degree of accuracy with low loss over wide scan areas, including a fixed illuminator retained in fixed position at the focal point of the reflector of the antenna. Surrounding the illuminator is a Cardanic joint which acts as a spherical hinge capable of radial rotation around the illuminator. Attached to the Cardanic joint is a support arm which is connected to the reflector. The reflector is therefore freely movable in a spherical path defined around the illuminator with the illuminator coinciding with the center of the sphere. The illuminator is kept within the focal point of the reflector regardless of the position of the reflector as it spherically rotates around the illuminator. Tension springs in the Cardanic joint and guide wires controlled by motors are provided for finely positioning the support arm and reflector in any given position along the spherical rotative path through which the reflector is able to move. The beam axis of the antenna is continuously variable through the complete range of motion of the reflector, and therefore the antenna system is capable of scanning over large areas. The fine positioning of the reflector and the lack of need for articulated connectors to the feed of the antenna provide for low loss and high pointing accuracy.
REFERENCES:
patent: 3696432 (1972-10-01), Anderson et al.
patent: 4070678 (1978-01-01), Smedes
patent: 4550319 (1985-10-01), Ganssle et al.
patent: 4862185 (1989-08-01), Andrews et al.
patent: 5091733 (1992-02-01), Labruyere
Patent Abstracts of Japan, vol. 8, No. 231 (E-274)(1968) Oct. 24, 1984 and JP-A-59 112 703 (Nippon Denshin Denwa Kosha) Jun. 29, 1984.
Review of the Electrical Communication Laboratories, vol. 35, No. 2, Mar. 1987, Kawakami et al. "On-Board Antenna Pointing Control System For Multi-Beam Communications Satellite."
Falconi Mario
Losquadro Giacinto
Brown Peter Toby
Hille Rolf
Selenia Spazio S.p.A.
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