Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1980-12-17
1998-05-05
Blum, Theodore M.
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
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.
Burdoin Robert B.
Kingston Samuel C.
Lamensdorf David
Blum Theodore M.
Lee, Jr. Robert E.
Lockheed Martin Corporation
Sowell John B.
Weinstein Stanton D.
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