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AssigneesFrance Telecom, Telediffusion de France
InventorsPascal Cousin, Jean-Louis Desvilles, Jean-Pierre Blot, Jean-Jacques Delmas
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An antenna receives beams from telecommunication satellites in geostationary orbit close to the equator. The continuous concave reflecting surface of the reflector of the antenna has an equation deduced from a paraboloid by adding thereto the equation of a correction surface comprising a second order polynomial and a sum of N(2N−1) terms depending on distances between the projection of any point on the reflecting surface and N(2N−1) control points of a grid extending over a plane perpendicular to the plane of symmetry. The angular separation of the primary sources on a circular support with an inclination different from the angle of offset is less than approximately 3° for an aperture of more than 50°.
An antenna comprising a reflector for telecommunication satellite beams having a continuous concave reflecting surface whose equation is deduced from the equation of an offset paraboloid having a focus and an offset angle by adding thereto the equation of a correction surface and which is symmetrical about a focal plane of symmetry of the paraboloid, wherein the equation of the correction surface comprises a second order polynomial in two coordinates relative to axes perpendicular to the axis of symmetry of the paraboloid and a sum of N(2N−1) terms depending in particular on distances between the projection of any point on the reflecting surface onto a plane perpendicular to said focal plane of symmetry and N(2N−1) control points of a grid extending over said perpendicular plane and limited by said focal plane of symmetry, where N is an integer not less than 2.
Dependencies are inferred from the claim text.