Low radar cross section (RCS) high gain lens antenna

Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor

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343911L, H01Q 1906

Patent

active

057481512

ABSTRACT:
A low radar cross section lens antenna having high gain is disclosed. A spherical lens having a dielectric radial gradient focuses planar RF energy coupled thereto onto a focal point on the surface of a lens located diametrically opposite from the first intersection of the plane wave and the lens. The lens partially encloses a wedge shaped RF absorbing portion having the edge of the wedge passing through the center of the lens. The lens is partially surrounded by a second RF absorbing portion having a bowl-like shape. An antenna feed having its aperture located adjacent the surface of the lens is mounted to rotate about an axis lying substantially along the edge of said wedge shaped absorbing portion. Elevation rotation means is provided to rotate the feed antenna within a slot contained within the second RF absorbing portion. The lens and wedge shaped PF absorbing portion, the second RF absorbing portion, the feed antenna and elevation rotation means are all rotatable around an axis perpendicular to the edge of the wedge.

REFERENCES:
patent: 3213454 (1965-10-01), Ringenbach
patent: 3255451 (1966-06-01), Wolcott
patent: 3343171 (1967-09-01), Goodman
patent: 3848255 (1974-11-01), Migdal
patent: 4085404 (1978-04-01), Gallant
patent: 4090198 (1978-05-01), Canty et al.
"Methods of Radar Cross-Section Analysis", Academic Press, New York (1968), pp. 273-280.
"Radar Cross Section Handbook", Plenum Press, N.Y., vol. 1 p. 195, by G. T. Ruck.

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