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US 4,400,701 AGranted
Common antenna for primary and secondary radar
AssigneeThomson-CSF
InventorAlbert Dupressoir
Life of this patent
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Abstract
A bifunctional antenna of a primary/secondary radar system comprises a reflector having a concave front surface illuminated by a source of primary radiation and formed with a row of circular ports along a horizontal generatrix, the ports lying forwardly of respective cavities or waveguides of cylindrical configuration excitable to emit circularly polarized secondary radiation. In some embodiments the polarization may be changed to a linear or an elliptical mode under the control of inserts rotatable about the cavity axis.
Claims11
A bifunctional antenna for a primary/secondary radar system, comprising:
- a reflector formed of a body of dielectric material with a reflective surface of crossed wires, said reflector being adapted to be illuminated by a primary source of outgoing radiation for detecting a remote target;
- a row of emitters of secondary radiation disposed along a generatrix of said front surface intersecting a boresight axis, said emitters being formed by circular ports in said front surface backed by cylindrical cavities having walls integral with said body, said cavities being coaxial with said ports and having axes extending in radial directions of said front surface;
- and
- wave-control means in said cavities adapted to establish a circular mode of polarization for the secondary radiation emitted thereby.
1 more element
Dependencies are inferred from the claim text.