A High-Gain Broadband Gradient Refractive Index Metasurface Lens Antenna

2016 ◽  
Vol 64 (5) ◽  
pp. 1968-1973 ◽  
Author(s):  
Elham Erfani ◽  
Mahmoud Niroo-Jazi ◽  
Serioja Tatu
Keyword(s):  
Refractive Index ◽  
High Gain ◽  
Lens Antenna ◽  
Gradient Refractive Index

scholarly journals Low Side Lobe Tapered Slot Antenna with High Gain Using Gradient Refractive Index Metamaterial for Ultra Wideband Application

2017 ◽  
Vol 6 (4) ◽  
pp. 63-69 ◽  
Author(s):  
R. Singha ◽  
D. Vakula
Keyword(s):  
Refractive Index ◽  
Beam Width ◽  
Parallel Line ◽  
Side Lobe ◽  
High Gain ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Side Lobe Level ◽  
Beam Focusing ◽  
Gradient Refractive Index

A broadband gradient refractive index (GRIN) metamaterial is used to improve the gain of the tapered slot antenna. The proposed metamaterial is capable of reducing the side lobe level of the antenna. The gradient refractive index (GRIN) metamaterial is constructed by using non-resonant parallel-line unit cells with different refractive index. Due to the non-resonant structure, the proposed unit cell exhibits low loss and large frequency bandwidth. The metamaterial, whose effective refractive index is lower than that of the substrate on which the antenna is printed. Therefore, the proposed metamaterial is act as a regular lens in beam focusing. The GRIN metamaterial is integrated in front of the antenna which has the capability to manipulate electromagnetic wave accurately. The measurement results indicate that the reflection coefficient of the antenna is below -10 dB over the frequency band from 3 to 11 GHz. The radiation pattern of the antenna shows the beam width becomes narrow and directive with low side lobe level. The peak gain is increased by 2.1 dB at 9.5 GHz.

A Novel Collapsible Flat-Layered Metamaterial Gradient-Refractive-Index Lens Antenna

2020 ◽  
Vol 68 (3) ◽  
pp. 1312-1321 ◽  
Author(s):  
Anastasios Papathanasopoulos ◽  
Yahya Rahmat-Samii ◽  
Nicolas C. Garcia ◽  
Jonathan D. Chisum
Keyword(s):  
Refractive Index ◽  
Lens Antenna ◽  
Gradient Refractive Index

A broadband slab lens antenna formed from gradient refractive index metamaterials composed of cross-shaped cells

2014 ◽  
Vol 56 (5) ◽  
pp. 1124-1129 ◽  
Author(s):  
Guishan Yuan ◽  
Xiaochun Dong ◽  
Qiling Deng ◽  
Chunheng Liu ◽  
Yueguang Lu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Lens Antenna ◽  
Gradient Refractive Index

Gradient refractive-index optical rod prepared from methacrylate derivatives

1997 ◽  
Vol 22 (10) ◽  
pp. 668 ◽  
Author(s):  
Jui-Hsiang Liu ◽  
Hung-Tsai Liu
Keyword(s):  
Refractive Index ◽  
Gradient Refractive Index

Hybrid Polymers for Gradient Refractive Index Lens

2021 ◽  
Author(s):  
Omena Okpowe ◽  
Andriy Durygin ◽  
Vadym Drozd ◽  
Temitayo Olowu ◽  
Nezih Pala ◽  
...  
Keyword(s):  
Refractive Index ◽  
Hybrid Polymers ◽  
Gradient Refractive Index

scholarly journals The Polymerization of MMA and ST to Prepare Material with Gradient Refractive Index in Electric Field

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Yao Huang ◽  
Daming Wu ◽  
Dongyun Ren ◽  
Qingyun Meng ◽  
Xiaojun Di
Keyword(s):  
Molecular Weight ◽  
Refractive Index ◽  
Electric Field ◽  
Cylindrical Sample ◽  
Electrical Field ◽  
Molecular Weights ◽  
The Matrix ◽  
Gradient Refractive Index ◽  
Scattering Material ◽  
Different Parts

Light scattering material with gradient refractive index was prepared under the electrical field by taking methyl methacrylate (MMA) monomer as the matrix with the addition of a little preheated styrene (ST) and peroxidation benzoin formyl (BPO). The material obtained under electrical field presented different transmittance and molecular weight at different parts of the cylindrical sample along the axis of the direction of electric field which led to the layering phenomenon and gradient refractive index. The disparity of molecular weight between different layers can be as much as 230 thousand. There were several peaks in the figure of GPC test of the sample under electric field. This proved that there were polymers with different molecular weights in the sample. Therefore, it can be concluded that electrical field has a significant effect on polymerization.

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