Antenna with a main reflector and a subreflector
AssigneeStandard Elektrik Lorenz AG
InventorsKlaus Becker, Gerhard Greving
Life of this patent
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Abstract
The antenna has a main reflector (1), a subreflector (4a, 4b, 5a, 5b), and a feed radiator (2) which are all rotationally symmetric about a common axis (10). In a section in the direction of this axis of symmetry (10), the subreflector has the shape of two curves meeting in the axis of symmetry. Seen from the feed radiator, these curves are concave. Each of the two curves has at least one step (6a, 6b) for matching the feed radiator to the transmitter or receiver.
Claims3
An antenna with a main reflector, a subreflector, and a feed radiator all having a common axis of symmetry, to form a rotationally symmetric subreflector, in a cross section in the direction of the axis of symmetry, having the shape of two curves which meet in said axis of symmetry and, from the direction of the feed radiator, are concave, wherein said two curves contain at least one step each, and such that the height of said step is selected so that the fractions of radiation reflected from the subreflector back to the feed radiator are superimposed one upon another so as to substantially cancel out the input of the feed radiator over a wide range of frequencies, said step being located from said axis of symmetry by about 1/10 the diameter of the subreflector.
Dependencies are inferred from the claim text.