Common antenna for primary and secondary radar

Details Common antenna for primary and secondary radar Common antenna for primary and secondary radar

1981-01-23

1983-08-23

Lieberman, Eli

Communications: radio wave antennas

Antennas

Plural separate diverse type

343756, 343840, H01Q 1522

Patent

active

044007019

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.

REFERENCES:
patent: 2895127 (1959-07-01), Padgett
patent: 3445850 (1969-05-01), Stegen
patent: 3550135 (1970-12-01), Bodmer

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