Journal ArticleDOI
Microwave Luneburg Lens
L. C. Gunderson,G T Holmes +1 more
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TLDR
A two-dimensional Luneburg lens is described, fabricated from steps of foam glass of different refractive index as an approximation to a continuous index gradient, which is an improvement over lenses fabricated by assembly of machined parts.Abstract:
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 glass lens is superior to a plastic lens since it is able to withstand higher temperatures and hence higher powers, in addition to having superior aging characteristics. Measurements have been made throughout the microwave band, and the results clearly establish the feasibility of this fabrication technique for the construction of a microwave Luneburg lens.read more
Citations
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Journal ArticleDOI
A 3-D Luneburg Lens Antenna Fabricated by Polymer Jetting Rapid Prototyping
TL;DR: In this article, a low-gain 20 dBi Luneburg lens antenna using a rapid prototyping machine as a proof-of-concept demonstrator was designed, built, and tested.
Journal ArticleDOI
A Printed, Broadband Luneburg Lens Antenna
Carl Pfeiffer,Anthony Grbic +1 more
TL;DR: In this paper, the design of a 2D broadband Luneburg lens antenna implemented using printed circuit board techniques is detailed, and the measured half power beamwidth of the experimental antenna is 4.34°.
Journal ArticleDOI
Glide-Symmetric Fully Metallic Luneburg Lens for 5G Communications at K a -Band
Oscar Quevedo-Teruel,Jingwei Miao,Martin Mattsson,Astrid Algaba-Brazalez,Martin Johansson,Lars Manholm +5 more
TL;DR: In this article, a fully metallic implementation of a Luneburg lens operating at the Ka-band with potential use for 5G communications is proposed, which is implemented with a parallel plate that is loaded with glide-symmetric holes.
Journal ArticleDOI
Nonuniform Luneburg and two-shell lens antennas: radiation characteristics and design optimization
TL;DR: In this paper, a GA with adaptive cost function is implemented to obtain the optimal design of a non-uniform Luneburg (1964) lens antenna, where the GA optimizer simultaneously determines the optimal material and its thickness for each shell by controlling the gain and sidelobes envelope of the radiation pattern.
Journal ArticleDOI
3-D-Printed Microwave and THz Devices Using Polymer Jetting Techniques
TL;DR: Important design and implementation aspects of polymer-jetting-based 3-D-printed EM components, including electromagnetic crystals (EMXT), waveguide, horn antenna, gradient index (GRIN) lenses, as well as3-D AM-enabled new designs, such as millimeter wave (mmW)/THz, reflect array antennas, computer-generated THz holograms, and so on are discussed.
References
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Book
Microwave antenna theory and design
TL;DR: This book discusses microwave antenna design problems, circuit relations, reciprocity theorems, and antenna measurements - techniques.
Journal ArticleDOI
Microwave heating of a Luneberg lens
TL;DR: In this paper, the maximum temperature rise due to dielectric dissipation in a Luneberg lens which is continuously illuminated by a powerful microwave transmitter, when the surface of the lens is held at a constant temperature is calculated.