Experiments on high-performance beam-scanning antennas made of gradient-index metamaterials

Feng, Hui; Chen, Xi; Xu, Haowei; Yang, Xin; Jiang, Wei; Cui, Tie Jun

doi:10.1063/1.3223608

Cited by 106 publications

(58 citation statements)

References 13 publications

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“…In the design of the new 3D lens, transformation optics has an important role. It has been widely used to design and generate other attractive devices such as invisibility cloaks [5][6][7][8][9][10][11][12][13][14][15][16] , electromagnetic concentrators and rotators [17][18][19] and high-performance antennas 20,21 . To design the 3D Luneburgbased lens, we start from a 2D geometry shown in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

Three-dimensional broadband and broad-angle transformation-optics lens

2010

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Luneburg lenses have superior performance compared with conventional lenses made of uniform materials with specially designed surfaces, but they are restricted by the difficulty of manufacturing the required gradient-index materials and their spherical focal surfaces. Recently, a new two-dimensional (2D) imaging lens was proposed and realized using transformation optics. such a 2D lens overcomes the aberration problem, has a flattened focal surface and is valid for extremely large viewing angles. Here, we show the design, realization and measurement of a three-dimensional (3D) approximate transformation-optics lens in the microwave frequency band. The 3D lens is made of non-resonant metamaterials, which are fabricated with multilayered dielectric plates by drilling inhomogeneous holes. simulation and experimental results demonstrate excellent performance of the 3D lens for different polarizations over a broad frequency band from 12.4 to 18 GHz. It can also be used as a high-gain antenna to radiate or receive narrow beams in large scanning angles.

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Section: Resultsmentioning

confidence: 99%

Three-dimensional broadband and broad-angle transformation-optics lens

2010

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“…At first, the near field data are collected along a circle surrounding the antenna, then Huygens' principle is used to get the far field information. The same method has been utilized by other researchers and proved to be effective in various situations [13,25,29,37]. Fig.…”

Section: Simulation Results and Discussionmentioning

confidence: 95%

“…Being an indispensable part in telecommunication systems, many new types of antennas have also been proposed based on this powerful tool [22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

A Planar Focusing Antenna Design With the Quasi-Conformal Mapping

Mei¹,

Bai²,

Niu³

et al. 2010

PIER M

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Abstract-We propose a planar focusing antenna design, which has the same performance as its parabolic counterparts and can be realized using PEC-backed gradient index dielectrics. In this design, quasi-conformal transformation optics is first utilized to transform a parabolic surface into a planar one, then the anisotropy factor of the resultant material is minimized, and the material is approximately treated as isotropic. Examples with realizable material parameters are given, and the simulation results validate the design. The proposed method could be used to design planar focusing antennas with high directivity and similar devices. The idea can also be applied to new device designs in optics engineering.

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“…Furthermore, since this is a non-resonant metamaterial, the lens is expected to have low loss, and can potentially operate over a wide bandwidth. This basic design may be extended to serve multiple functions, such as combined deflection and collimation, by careful selection of the refractive index characteristic [10]. A unit cell of this metamaterial is given in Fig.…”

Section: Introductionmentioning

confidence: 99%