Self-actuated off-center subreflector scanner

Details Self-actuated off-center subreflector scanner Self-actuated off-center subreflector scanner

1998-12-01

2000-06-20

Le, Hoanganh

Communications: radio wave antennas

Antennas

With means for moving directive antenna for scanning,...

343757, 343781CA, H01Q 300

Patent

active

06078296&

ABSTRACT:
An optical reflector antenna utilizes a subreflector that is offset from the optical axis of the antenna and that revolves about the optical axis to scan the beam from the antenna in a circular path about the axis of the antenna to facilitate the search for and acquisition of a satellite for subsequent tracking and communications. The subreflector is mounted on a rotatable shaft that is aligned with the optical axis of the antenna. When the shaft is not being rotated, one or more springs hold the subreflector in a fixed position aligned with the optical axis of the antenna to facilitate tracking and communications. When the shaft is rotated, rotational forces cause the subreflector to shift to and remain at a position that is offset from the optical axis and the rotation of the shaft causes the offset subreflector to revolve about the optical axis of the antenna, thus scanning the beam from the antenna to facilitate the search for and and the acquisition of the satellite.

REFERENCES:
patent: 4939526 (1990-07-01), Tsuda
patent: 5198827 (1993-03-01), Seaton
patent: 5351060 (1994-09-01), Bayne

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