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US 3,968,497 AGranted
Antenna with a periscope arrangement
AssigneeThomas-CSF
InventorNhu Bui Hai
Life of this patent
Estimating the term…
Abstract
In an antenna of the Cassegrainian or Gregorian type including a periscope arrangement, the auxiliary reflector has a longer focal distance than the auxiliary reflector of a conventional antenna of this type and the length of the optical path between the auxiliary reflector and the primary source of the antenna is choosen substantially equal to the distance between the auxiliary reflector and that one of its two foci which is the more remote therefrom. This makes it possible to use only plane mirrors in the periscope arrangement.
Claims6
An antenna comprising, in series, for defining a radiation path:
- a primary source, a periscope arrangement with n (n being a positive integer) successive mirrors, said n mirrors being successively arranged along said path and being all plane mirrors, an auxiliary reflector having first and second foci, the distance between said first focus and the auxiliary reflector being smaller than the distance between said second focus and the auxiliary reflector, and a main reflector having a reflecting face;
- said main reflector being physically located between said auxiliary reflector and said periscope arrangement;
- said first and second foci being respectively located in front of and behind the reflecting face of said main reflector and said distance between said second focus and said auxiliary reflector being substantially equal to the length of that part of said radiation path which is comprised between said auxiliary reflector and said primary source.
Dependencies are inferred from the claim text.