Scanning antenna with extended off broadside scanning capability

Details Scanning antenna with extended off broadside scanning capability Scanning antenna with extended off broadside scanning capability

1975-05-12

1977-01-04

Lieberman, Eli

Communications: radio wave antennas

Antennas

With spaced or external radio wave refractor

343761, H01Q 318

Patent

active

040018350

ABSTRACT:
An improved Lewis scanner comprising a focal lens having two best focus angles positioned with its axis at an angle other than perpendicular to the antenna aperture. The antenna aperture is maintained vertical with respect to the earth's surface to provide a planar beam at 0.degree. elevation. The focal lens axis is oriented at an angle of typically one-half the maximum elevation scan angle. The angle of the microwave reflector between the parallel plates of the Lewis scanner is changed from the conventional 45.degree. by one-half the angle between the focal lens axis and the 0.degree. elevation angle. An asymmetric feed lens improves the beam shape over the entire scan range.

REFERENCES:
patent: 3408654 (1968-10-01), Walker
patent: 3761935 (1973-09-01), Silbiger
patent: 3833909 (1974-09-01), Schaufelberger

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