Patent
Loss-free scanning antenna
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TLDR
In this paper, a two-dimensional scan, loss-free, Cassegrain antenna system with a very large primary reflector of an antenna system without loss (i.e., with zero phase error) was proposed.Abstract:
A system for, and a method of, scanning a collimated beam of electromagnetic radiation with a very large primary reflector of an antenna system without loss (ie, with zero phase error) and without moving the primary reflector The system is a two dimensional scan, loss-free, Cassegrain antenna system which comprises a stationary, parabolic-shaped, primary reflector, and a smaller, movable, parabolic-shaped subreflector, and also a movable, plane wave, electromagnetic radiation beam source interposed between the two reflectors It is shown that, without moving the primary reflector, the beam can be scanned over wide angles with no phase error in the plane of scan, provided that the source and the subreflector are rotated about the focal point of the antenna in a specific manner A unique angular relationship between the source and the subreflector is required for each scan angle, and is taught The method includes the step of using this antenna system in scanning the beam from the primary reflector, without any phase error and without moving the primary reflectorread more
Citations
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Reflector antenna, especially for a communications satellite
TL;DR: In this paper, a reflector antenna for a communications satellite, having at least one fixed main reflector (102) with an essentially circular aperture, was proposed. But the antenna design was not considered.
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References
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Patent
Scanning antenna with moveable beam waveguide feed and defocusing adjustment
Hiroshi Yokoi,Masataka Akagawa +1 more
TL;DR: In this paper, an aperture antenna consisting of at least one reflector, a primary radiator, and a plurality of movable beam-wave-guide reflectors arranged between the reflector and the primary radiator is used for directing electric waves from the primary radiators towards the reflectors.
Patent
Satellite tracking cassegrainian antenna
Hiroshi Yokoi,Masataka Akagawa +1 more
TL;DR: In this paper, the beam wave-guide reflector or electromagnetic lens is moved to deflect the antenna beam to avoid being hit by the antenna's beam, and the antenna rotating axis is adapted to be rotatable only within a small angular range.
Patent
Scanning antenna having a spherical main reflector with moveable subreflector
TL;DR: In this paper, the main lobe of an antenna with a large spherical reflector and a small reflector may be oriented with respect to the large reflector by virtue of the displacement of the small reflectors.