Graphene-Based Multi-Beam Reconfigurable THz Antennas

Luo, Yong; Zeng, Qingsheng; Yan, Xin; Wu, Yong; Lu, Qichao; Zheng, Chaofan; Hu, Nan; Xie, Wei; Zhang, Xia

doi:10.1109/access.2019.2903135

Cited by 62 publications

(24 citation statements)

References 19 publications

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“…Equations represent the intra‐band conductivity and inter‐band conductivity of graphene, respectively. μ is the chemical potential of graphene, which can be adjusted by applying a direct‐current (DC) bias on the graphene . T is the temperature, e is the charge number of an electron, i is the imaginary unit, ℏ is the reduced Planck constant, ω is the angular frequency, k B is the Boltzmann's constant, and τ is the relaxation time.…”

Section: Graphene Modelmentioning

confidence: 99%

“… T is the temperature, e is the charge number of an electron, i is the imaginary unit, ℏ is the reduced Planck constant, ω is the angular frequency, k B is the Boltzmann's constant, and τ is the relaxation time. In this work, τ and T are set as 1 ps and 300 K, respectively . Moreover, only the intra‐band conductivity is considered during the numerical simulation, because the contribution of the inter‐band conductivity is very small when the frequency range is less than 10 THz …”

Section: Graphene Modelmentioning

confidence: 99%

See 1 more Smart Citation

A graphene‐based tunable negative refractive index metamaterial and its application in dynamic beam‐tilting terahertz antenna

Luo

Zeng

Yan

et al. 2019

Micro & Optical Tech Letters

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Graphene is emerging as a kind of promising 2D material in designing reconfigurable terahertz (THz) devices owning to its tunability of the surface conductivity, which can be tuned by changing the chemical potential. In this work, we demonstrated a graphene-based THz tunable negative refractive index metamaterial. The proposed metamaterial unit consists of a metallic resonant structure and embedded graphene, which presents a dynamic negative refractive index in the corresponding bands by modulating the chemical potential of the embedded graphene. In addition, a dynamic beam-tilting antenna loaded with the metamaterial-based stacked configuration has been designed. Through changing the refractive index of the metamaterial or the number of layers in the stacked configuration, the steering angle can be adjusted from 0 to −27 . This work demonstrates the great potential of graphene in THz tunable negative refractive index materials, provides a classic case about the practical application of controllable negative refractive index, and also gives an effective way to design dynamic beam-tilting antenna.

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Section: Graphene Modelmentioning

confidence: 99%

Section: Graphene Modelmentioning

confidence: 99%

A graphene‐based tunable negative refractive index metamaterial and its application in dynamic beam‐tilting terahertz antenna

Luo

Zeng

Yan

et al. 2019

Micro & Optical Tech Letters

Self Cite

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show abstract

“…Hence in this work, only the intra‐band contribution is considered. Moreover, the strong dependence of the conductivity on the chemical potential offers a simple way to tune the performance of the graphene‐based device, for example, applying a DC bias on the graphene . In addition, it is clearly that the chemical potential has a greater impact on the imaginary part of conductivity, which means the tunability of graphene‐based THz device benefits more from the changeable imaginary part.…”

Section: Surface Conductivity Model Of Graphenementioning

confidence: 99%

A graphene‐based tunable miniaturized‐element frequency selective surface in terahertz band and its application in high‐isolation multiple‐input multiple‐output system

Luo

Zeng

Yan

et al. 2019

Micro & Optical Tech Letters

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Graphene is a promising material for terahertz (THz) reconfigurable devices due to the tunability of the surface conductivity. Here, a graphene-based THz miniaturizedelement tunable band-stop frequency selective surface (FSS) is demonstrated. The proposed FSS unit cell consists of convoluted metallic strips with graphene embedded between adjacent metallic strips. The center resonance frequency of the stop band shows an obvious blue shift from 1.76 to 2.56 THz when increasing the chemical potential of the graphene from 0 to 0.5 eV. Particularly, the convoluted design leads to an ultra-small cell dimension of 11.73% of the free space wavelength at resonance frequency (1.76 THz). In addition, the positive role of the proposed FSS in enhancing the isolation of the multiple-input multiple-output (MIMO) system has been verified through two simple models. This work provides an effective method to design miniaturizedelement graphene-based tunable FSSs, and gives a simple way to realize high-isolation MIMO systems. K E Y W O R D S frequency selective surface, graphene, isolation enhancement, MIMO, terahertz

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“…In recent years, terahertz (THz) wave has been widely used in broadband communication [1], object imaging [2], and environmental monitoring [3], owing to its high image analyticity, and unique penetrability [4]. THz antennas have the potential to provide high bandwidth for data transfer, which improves spatial directivity and resolution [5].…”

Section: Introductionmentioning

confidence: 99%

A Reconfigurable Graphene Nanoantenna on Quartz Substrate

Gao¹,

Lou²,

Lü³

2020

I2M

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In the terahertz (THz) band, conventional metallic antennas are virtually infeasible, due to the low mobility of electrons and huge attenuation. The existing metallic THz antennas need a high power to overcome scattering losses, and tend to have a low antenna efficiency. Fortunately, graphene is an excellent choice of miniaturized antenna in millimeter/THz applications, thanks to its unique electronic properties in THz band. Therefore, this paper presents two miniaturized reconfigurable graphene antennas, and characterizes their performance in terms of frequency reconfiguration, omnidirectional radiation pattern, and radiation efficiency. The proposed graphene antennas were printed on a quartz substrate, and simulated on CST Microwave Studio. The results show that the excellence of the proposed antennas in reflection coefficient, dynamic frequency reconfiguration (DFR), and omnidirectional radiation pattern. The operation frequency of the two antennas varies from 0.74 to 1.26 THz and from 0.92 to 1.15 THz, respectively. The proposed antennas have great prospects in wireless communications/sensors.

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Graphene-Based Multi-Beam Reconfigurable THz Antennas

Cited by 62 publications

References 19 publications

A graphene‐based tunable negative refractive index metamaterial and its application in dynamic beam‐tilting terahertz antenna

A graphene‐based tunable negative refractive index metamaterial and its application in dynamic beam‐tilting terahertz antenna

A graphene‐based tunable miniaturized‐element frequency selective surface in terahertz band and its application in high‐isolation multiple‐input multiple‐output system

A Reconfigurable Graphene Nanoantenna on Quartz Substrate

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