Two-band microwave antenna with nested horns for feeding a sub a

Details Two-band microwave antenna with nested horns for feeding a sub a Two-band microwave antenna with nested horns for feeding a sub a

1982-01-21

1984-12-18

Lieberman, Eli

Communications: radio wave antennas

Antennas

With spaced or external radio wave refractor

343756, 343777, 343781CA, H01Q 1300, H01Q 500, H01Q 1523

Patent

active

044893310

ABSTRACT:
A two-band multimode microwave source for an antenna of a low-elevation-tracking radar comprises a higher-frequency section nested in a lower-frequency section, the two sections having E-planes perpendicular to each other. The lower-frequency section includes two outer pairs of waveguides separated by a block which convergingly projects beyond their output ends and is bisected by the E-plane of that section. The higher-frequency section includes two inner pairs of waveguides disposed within that block and separated by an obstruction lying in the last-mentioned E-plane. The higher-frequency wave emitted by the inner waveguides is made planar by a lens disposed at n output aperture of the structure which is transparent to the lower-frequency wave. In a Cassegrain-type radar antenna the lower-frequency wave emitted by the source is returned by a semitransparent intermediate reflector toward a main reflector provided with a grid which rotates its plane of polarization to let it pass out through the intermediate reflector along with the higher-frequency wave which, passing unattenuated through the intermediate reflector, is returned by a solid outlying reflector to the main reflector.

REFERENCES:
patent: 2425488 (1947-08-01), Peterson et al.
patent: 3495262 (1970-02-01), Paine
patent: 3665481 (1972-05-01), Low et al.
patent: 3825932 (1974-07-01), Hockham
patent: 4096482 (1978-01-01), Walters
patent: 4220957 (1980-09-01), Britt
patent: 4241353 (1980-12-01), Salvat et al.
Drabowitch, "Multimode Antennas", Microwave Journal, Jan. 1966.
Drabowitch, "Theory and Application of Multimode Antennas", CFTH Technical Review, Nov. 1962.
Von Trentini, "Review of Presently Employed Narrow-Beam Microwave Antennas", Jun. 1975.

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