Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Reexamination Certificate
2000-08-25
2001-07-17
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
C343S763000, C343S882000
Reexamination Certificate
active
06262687
ABSTRACT:
The present invention relates in general to antennas, and more particularly to antennas having rotating or moving reflectors for tracking satellites and other objects.
Wireless communications systems are currently using satellites to facilitate the global exchange of information. Such systems often use Low Earth Orbiting (LEO) satellites which are linked to each other and to ground based stations to provide wireless access over most of the Earth's surface.
The ground stations use tracking antennas that follow the satellites as they send and receive communication signals. These signals are generated and/or processed by a control unit installed in the ground station. The signals are routed through an antenna cable to a rotating parabolic reflector, so that one end of the cable is fixed while the other is in almost constant motion. As a result, the cable is subjected to twisting and/or bending displacement that can wear out or break the cable, reducing the operating life and reliability of the antenna.
Previous antennas try to reduce the cable stress and wear by using sliding racks, restricted motion chain mechanisms, and other devices to control the cable's motion. However, these devices add a significant cost to the antenna's manufacture, and are subject to wearing out themselves.
there is a need for a more reliable antenna that reduces the stress and wear on the antenna cable without increasing the manufacturing cost of the antenna.
REFERENCES:
patent: 5619215 (1997-04-01), Sydor
patent: 6188367 (2001-02-01), Morrison et al.
Bai Monty W.
de Guzman Jeff P.
Bogacz Frank J.
Le Hoang-anh
Motorola Inc.
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