Radar antenna with rotating linear polarization designed to redu

Details Radar antenna with rotating linear polarization designed to redu Radar antenna with rotating linear polarization designed to redu

1980-06-12

1982-06-15

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

With polarization filter or converter

343 18E, 343100PE, 343781CA, H01Q 1524, G01S 736, H01Q 1900

Patent

active

043353878

ABSTRACT:
A radar antenna of the Cassegrain type comprises a paraboloidal principal reflector confronting a hyperboloidal or flat auxiliary reflector of smaller radius directing linearly polarized radiation from a source on their common axis toward the principal reflector along lines passing through the focal point thereof to produce an axially extending outgoing beam whose central part is intercepted by the auxiliary reflector. The latter consists of an array of linear conductors generally parallel to the direction of polarization while the principal reflector is formed by another conductor array generally inclined at 45.degree. to that direction, the latter array being backed by a solid mirror separated therefrom by a distance smaller than a quarter wavelength at the midfrequency of the emitted radiation. The composite wave leaving the principal reflector has an elliptical polarization which it retains in an annular portion of the outgoing beam bypassing the auxiliary reflector; only a linearly polarized component of that wave rotated through 90.degree. from the original direction of polarization, however, passes the array of the auxiliary reflector in the central beam portion intercepted thereby.

REFERENCES:
patent: 2736895 (1956-02-01), Cochrane
patent: 3771160 (1973-11-01), Laverick
patent: 3797020 (1974-03-01), Roger et al.
patent: 4220957 (1980-09-01), Britt

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