Luneberg Lens

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Luneberg lens

[′lü·nə‚bərg ‚lenz]
A type of antenna consisting of a dielectric sphere whose index of refraction varies with distance from the center of the sphere so that a beam of parallel rays falling on the lens is focused at a point on the lens surface diametrically opposite from the direction of incidence, and, conversely, energy emanating from a point on the surface is focused into a plane wave. Accurately spelled Luneburg lens.

Luneberg Lens


a lens antenna in which the maximum of the directivity pattern may be controlled over a wide angular sector. It was proposed by the American scientist R. K. Luneberg in 1944. It is used mainly in radar installations in the centimeter wavelength range.

A Luneberg lens is spherical or cylindrical and is characterized by the fact that the index of refraction of the lens material is not constant throughout the lens but rather is a function of the distance to its center (for a spherical lens) or its axis (for a cylindrical lens). This function is chosen so that the wavefront becomes a plane after passing through the lens. By shifting the radiator along the lens surface, the direction of maximum radiation may be varied through a solid angle of up to without altering the shape of the directivity pattern.

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References in periodicals archive ?
These requirements stimulate an increasing interest in the development of Luneberg lens antennas (LLA) with multiband and multi-polarized feed-system.
Nie, "Study on multiple frequencies and polarizations feed technique in luneberg lens antenna," Intelligent Signal Processing and Communication Systems (ISPACS) Int.
The electromagnetic theory of the spherical luneberg lens," Appl.
The HMD can carry smoke, IR flares, passive or active radar augmenters or a Luneberg lens (a radar signal reflector).
Intended as a radar decoy, Delilah's mission payload can be either a Luneberg lens or what are described as "active radio-frequency repeaters" operating in the A, C and L bands.
Tenders are invited for Procurement of bistatic luneberg lens xbr 0.
p] represents the control precision of permittivity for each layer, especially for the composite foam materials for Luneberg lens.
On the other hand, for a conventional 2-layer uniform Luneberg lens antenna (LLA) with the same dimensions and dielectric losses, the corresponding aperture efficiencies are only 15.
Vinogradov, "Scattering by a Luneberg lens partially covered by a metallic cap," Journal of Electromagnetic Waves and Applications, Vol.