Results 151 to 160 of about 503,018 (197)
Non-Uniform Metasurface Luneburg Lens Antenna Design
IEEE Transactions on Antennas and Propagation, 2012 A metasurfing concept is demonstrated and applied in the design of Luneburg lens antennas. Using an array of size-varying circular patches on a dielectric substrate inside a parallel-plate waveguide (PPW) structure variable surface impedance is obtained,
Marko Bosiljevac +2 more
exaly +2 more sources
Active Reconfigurable Luneburg lens at 60GHz
, 2015 An active receiver antenna with beam scanning and beam shaping capability is described. This antenna is based on a plate inhomogeneous Luneburg lens fed by several waveguide sources. Firstly, a plate Luneburg lens is manufactured thru a new technological process allowing to change the refractive index of a single foam layer.
Lafond, O. +4 more
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Applied Optics, 1968
This article describes a two-dimensional Luneburg lens, fabricated from steps of foam glass of different refractive index as an approximation to a continuous index gradient. This is an improvement over lenses fabricated by assembly of machined parts, which unavoidably contain some air gaps, resulting in different path lengths through the lens. The foam
L C, Gunderson, G T, Holmes
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This article describes a two-dimensional Luneburg lens, fabricated from steps of foam glass of different refractive index as an approximation to a continuous index gradient. This is an improvement over lenses fabricated by assembly of machined parts, which unavoidably contain some air gaps, resulting in different path lengths through the lens. The foam
L C, Gunderson, G T, Holmes
openaire +2 more sources
Luneburg lens composed of sunflower-type graded photonic Crystals
Optics Communications, 2014 Sunflower-type graded photonic crystals (GPCs) are investigated and used to design the Luneburg lens for transverse electric (TE) and transverse-magnetic (TM) polarizations.
Yu Hao
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A Luneburg lens in moving coordinates
Optics and Spectroscopy, 2016The reflection of light rays by a reference microsatellite of new design, which moves with a velocity of 7500 m/s along a near-Earth orbit with a radius of 835 km, is calculated. The microsatellite is a bilayer Luneburg lens with an outer radius of 85 mm.
V. O. Gladyshev, A. A. Tereshin
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Sound focusing by a broadband acoustic Luneburg lens
The Journal of the Acoustical Society of America, 2022The high-performance and aberration-free broadband acoustic lens holds promise for extensive applications, yet remains challenged. In this work, a scheme is proposed, and the experimental demonstration of a planar acoustic Luneburg lens capable of focusing broadband sound ranging from 1 to 3 kHz (relative bandwidth approaching to 100%) in an aberration-
Baoguo Yuan +4 more
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Luneburg Lens Approach to Nuclear Rainbow Scattering
Physical Review Letters, 2002The physical interpretation of nuclear rainbow scattering within the frame of the optical model is critically investigated. Starting from the properties of the Luneburg lens, a gradient index device that displays refractive features similar to those of the nuclear potential, important differences between the mechanisms producing the nuclear and optical
Michel, Francis +2 more
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A sliced spherical Luneburg lens
IEEE Antennas and Wireless Propagation Letters, 2003The Luneburg lens (LL) represents a very attractive candidate for many applications such as multibeam antennas, multifrequency scanning, and spatial scanning, due to its focusing properties. Indeed, it is a dielectric sphere on which each surface point is a frequency-independent perfect focusing point.
S. Rondineau, M. Himdi, J. Sorieux
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A Multibeam Tapered Cylindrical Luneburg Lens
IEEE Transactions on Antennas and Propagation, 2021We present a cylindrical, multibeam, modified Luneburg lens antenna. The proposed antenna features low-profile, good impedance match, high gain, and wide angle scanning capability. We tapered the thickness of a dielectric disk along its radius to achieve the required refractive index profile of the lens in a nondispersive fashion.
M. Mirmozafari +4 more
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A high temperature Luneburg lens
Proceedings of the IEEE, 1968A Luneburg lens is described which has been fabricated from foam glass. The electrical performance is presented at X-band. The theoretical power-handling capability of this lens is conservatively estimated at 6 times that of an equivalent lens fabricated from expanded polystyrene.
L.C. Gunderson, K.F. Kauffman
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