Theoretical analysis of graphene nanoantennas with different shapes

Costa, Karlo Q. da; Dmitriev, Victor; Nascimento, Clerisson; Silvano, Gustavo L.

doi:10.1002/mop.28264

Cited by 6 publications

(8 citation statements)

References 11 publications

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“…The experimental results show that edge effects on the graphene conductivity can be disregarded in the micrometer scale [15]. Therefore, one can use the electrical conductivity model developed for infinite graphene sheet.…”

Section: Graphene Surface Conductivitymentioning

confidence: 99%

“…Significant benefits can be obtained for graphene antennas in telecommunications applications such as monolithic integration with nanoelectronic graphene radio frequency (RF), efficient dynamic adjustment through chemical potential, relatively low loss in the band of terahertz (THz), and the possibility of miniaturization of antennas due to common plasmon effect in metamaterials [12,13]. On the other side, there are few alternatives and works in literature about broadband graphene antennas [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…In this chapter, a theoretical analysis was made in a broadband graphene antenna composed by a rectangular dipole and a circular loop. The analysis is made using the two-dimensional method of moments (MoM 2D) with surface impedance [15,16]. It was calculated by input impedance, reflection coefficient, and bandwidth from antennas with different geometrical parameters and values of chemical potential in the range of 0.5-2 THz.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Broadband Dipole-Loop Graphene Antenna for Applications in Terahertz Communications

da¹,

de²,

Pinto³

et al. 2018

Antennas and Wave Propagation

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Graphene possesses good properties as unusually high electron mobility, atomic layer thickness, and unique mechanical flexibility, which made it one promising material in the design of terahertz antennas. In this book chapter, we present a numerical analysis of a broadband dipole-loop graphene antenna for application in terahertz communications. The bidimensional method of moments (MoM-2D), with equivalent surface impedance of graphene, is used for numerical analysis. First, we review the principal characteristics of the conventional rectangular graphene dipole. Then, we consider the broadband graphene antenna, composed by one rectangular dipole placed near and parallel to a circular-loop graphene element, where only the dipole is feed. In this analysis, we investigated the effects of the geometrical parameters and the chemical potential, of the graphene material, on the overall characteristics of the compound antenna. Some results are compared with simulations performed with software based on finite element method. The results show that this simple compound graphene antenna can be used for broadband communications in the terahertz band.

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Section: Graphene Surface Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Broadband Dipole-Loop Graphene Antenna for Applications in Terahertz Communications

da¹,

de²,

Pinto³

et al. 2018

Antennas and Wave Propagation

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“…Devido a estas excepcionais propriedades, o grafeno se mostra um material promissor para as mais diversas aplicações, como camuflagem de dispositivos [3], atuação em sensores, promovendo um aumento na interação entre campo e matéria [4][5], aplicação em sistemas fotovoltaicos baseados em grafeno [6], atuação como elemento de regulação das propriedades plasmônicas de nano antenas ópticas metálicas [7], aplicação no projeto de antenas baseadas em grafeno [8][9][10], guiamento de ondas entre outros [11].…”

Section: Introductionunclassified

Análise Espectral de uma Folha de Grafeno Excitada por uma Linha de Corrente Magnética

Pires¹,

Costa²

2018

Anais De XXXVI Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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Resumo-O grafeno é um material bidimensional que possui propriedades com potencias aplicações em telecomunicações na faixa do terahertz. Neste trabalho, é apresentada uma análise espectral do espalhamento eletromagnético de uma folha de grafeno excitada por uma linha de corrente magnética. O método utiliza a representação das funções de Green bidimensional em termos de transformada de Fourier e função de Green unidimensional. São apresentados resultados numéricos da distribuição espacial do campo magnético e análise espectral da onda superficial plasmônica sobre o grafeno. Os resultados mostram a influência do potencial químico e das permissividades dos meios sobre as características do modo plasmônico. Palavras-chaves-Espalhamento eletromagnético, folhas de grafeno, terahertz, análise espectral.

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“…标离散步骤提高计算效率。时域数值算法可采用表面阻抗边界(The surface impedance boundary condition，SIBC))来处理这一问题 [1,2] 。类似的道理，对于薄涂层介质，其表面的涂层厚度一般小于透入深度，但基底介质的尺度大于透入深度。此情形对涂层精确建模极其耗费计算资源，也可采用传输线阻抗边界(The transmission impedance boundary condition，TIBC)进行近似处理 [3][4][5][6][7][8] 。阻抗边界条件可用于处理如前所述的特定电磁问题，曾被多种数值算法研究，其关键点在在于如何处理复杂的阻抗函数。H. Beggs 曾采用时域有限差分法(the finite difference time-domain method，FDTD)研究了高电导率近似情形的 SIBC 边界，采用了 prony 方法对阻抗函数处理 [9] 。K.…”

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A simplified impedance boundary algorithm in discontinuous Galerkin time-domain

Yang¹,

Wei²,

Li³

et al. 2023

Acta Phys. Sin.

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Large-size conductive targets or coated targets are difficult issues in computational electromagnetics. In general, such targets can be classified as multi-scale problems. Multi-scale problems usually consume a large number of computational resources. Researchers are devoted to seeking fast methods for these problems. When the skin depth is less than the size of a conductive target, the tangential components of the electric and magnetic fields over the surface of the target can be correlated by the surface impedance Ẑ. Ẑ is usually a complex function of the frequency, and it can be used to formulate an impedance boundary condition (IBC) to describe iterative equations in time domain methods to avoid the volumetric discretization of the target to improve computational efficiency. This condition is commonly known as the surface impedance boundary condition (SIBC). Similarly, for a conductor with thickness on the order or less than the skin depth, it also has high resource requirements if the target is straightforward volumetric discretization. The transmission impedance boundary condition (TIBC) can be applied to replace a coated object to reduce resource requirements. Thus, volumetric discretization is not required. There are few studies on the IBC scheme in the DGTD method. P. Li discussed the IBC scheme in DGTD, which involves complex matrix operations in the processing of IBC. In the DGTD method, numerical flux is used to transmit data between neighboring elements, and the key to the IBC scheme in DGTD is how to handle numerical flux. We hope to propose a DGTD method with a simple form and matrix-free IBC scheme. The key in dealing with IBC in DGTD is numerical flux. Unlike the literature, the impedance ẐR is not approximated by rational functions in our study. A specfic function ẐR obtained after the derivation in this paper is approximated by rational functions in the Laplace domain using the vector-fitting (VF) method, and its time-domain iteration scheme is given. This approach avoids matrix operations. The TIBC and SIBC processing schemes are given in section 4. The proposed method's advantage is that the upwind flux's standard coefficients are retained, and the complex frequency-time conversion problem is implemented by the vector-fitting method. The one-dimensional and three-dimensional examples also show the accuracy and effectiveness of our work in this paper.

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Theoretical analysis of graphene nanoantennas with different shapes

Cited by 6 publications

References 11 publications

Numerical Analysis of Broadband Dipole-Loop Graphene Antenna for Applications in Terahertz Communications

Numerical Analysis of Broadband Dipole-Loop Graphene Antenna for Applications in Terahertz Communications

Análise Espectral de uma Folha de Grafeno Excitada por uma Linha de Corrente Magnética

A simplified impedance boundary algorithm in discontinuous Galerkin time-domain

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