A Dual-Band Compact Metamaterial Absorber with Fractal Geometry

Venneri, F.; Costanzo, Sandra; Borgia, A.

doi:10.3390/electronics8080879

Cited by 25 publications

(19 citation statements)

References 21 publications

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“…(MHz) Dimensions 3 Trans. plastic ( 3–4, tan 0.01) 920 5 FR4/Air ( 4.4/1, tan 0.02/0) 910 6 PVC plastic ( 2.68, tan 0.01) 920 7 Cardboard ( 1.8, tan 868 10 Cardboard ( 1.45–1.65, tan 0.02–0.5) 868 11 FR4 epoxy ( 4.4, tan 0.02) 900 12 FR4 epoxy ( 4.4, tan 0.02) 868 13 FR4 epoxy ( 4.2, tan 0.02) 878/956 …”

Section: Analysis and Designunclassified

“…A literature review study reveals that metasurface absorbers are well-investigated mostly in the GHz rather than the MHz frequency range of the UHF band. This stems from the fact that, in the MHz range, such absorbers are rather thick and quite large in size with narrow bandwidth 5 , 10 – 13 . Techniques such as employing costly ferrite materials 9 and using lumped elements in the unit-cell design 14 can potentially lead to thinner design and increased bandwidth, respectively.…”

Section: Introductionmentioning

confidence: 99%

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An ultra-thin double-functional metasurface patch antenna for UHF RFID applications

Koohestani

Ghaneizadeh

2021

Sci Rep

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An ultra-thin double-functional metasurface patch antenna (MPA) was proposed, where it can operate not only in the antenna mode but also can simultaneously act as perfect absorber for normal incident waves, suitable for RFID applications in the 868 MHz band. The MPA structure consists of a typical coaxially-fed patch antenna merged, for the first time, with a metasurface absorber acting as artificial ground. A methodology for the unit-cell design of the metasurface is proposed followed by an equivalent circuit model analysis, which makes it possible to transform a low-loss ($$tan\delta =0.0015$$ t a n δ = 0.0015 ) unit-cell with highly-reflective characteristics to a perfect absorber for normal incident waves. It is based on modifying the critical external coupling by properly introducing slits on the unit-cell, allowing to design an ultra-thin ($$\lambda _0/225$$ λ 0 / 225 at 868 MHz) and a very compact structure in comparison to previously developed designs. For validation purposes, the MPA was fabricated and its performances in both functional modes were characterized numerically and experimentally. It is demonstrated that merging the absorber with the patch not only allows obtaining a well-matched ($$|S_{11}|<-30$$ | S 11 | < - 30 dB) antenna with an enhanced gain (by 175.6% compared to a typical patch) at the desired frequency but also leads to an overall thickness of only 2.5 mm ($$\lambda _0/138.1$$ λ 0 / 138.1 at 868 MHz). With an absorber size limited to the MPA dimensions, a reasonable 1.3 dB reduction in powers reflected by the MPA was achieved compared to a similar size metallic sheet. Whilst having the lowest profile among the so far reported RFID readers, the proposed MPA can be conveniently fitted for example within the required volume of smart shelf RFID readers or used in portable RFID readers while being capable of mitigating multipath reflection issues and incorrect reading of RFID.

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Section: Analysis and Designunclassified

Section: Introductionmentioning

confidence: 99%

An ultra-thin double-functional metasurface patch antenna for UHF RFID applications

Koohestani

Ghaneizadeh

2021

Sci Rep

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“…The second part of the FATD, G x (t), corresponds to subdiffusion along the backbone [4]. Therefore, to estimate the FATD by the Laplace inversion, we follow the same procedure of Equations (19) and (20) that yields…”

Section: Single Sinkmentioning

confidence: 99%

“…In particular, an intermittent search process on a dendrite tree has been considered [11], while a relation between the comb model and a spine dendrite structure has been established as well [12][13][14][15] with further explorations of anomalous diffusion inside spine dendrites [16][17][18]. Another important application relates to fabrication of fractal absorbers in metamaterials applied for antenna technology (see, e.g., [19] and references therein). The main question in task is the first arrival time distribution (FATD) for a fractal structure of sinks F µ , where traveling particles are absorbed.…”

Section: Introductionmentioning

confidence: 99%

Fractional Diffusion to a Cantor Set in 2D

Iomin

Sandev

2020

Fractal Fract

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A random walk on a two dimensional square in R2 space with a hidden absorbing fractal set Fμ is considered. This search-like problem is treated in the framework of a diffusion–reaction equation, when an absorbing term is included inside a Fokker–Planck equation as a reaction term. This macroscopic approach for the 2D transport in the R2 space corresponds to the comb geometry, when the random walk consists of 1D movements in the x and y directions, respectively, as a direct-Cartesian product of the 1D movements. The main value in task is the first arrival time distribution (FATD) to sink points of the fractal set, where travelling particles are absorbed. Analytical expression for the FATD is obtained in the subdiffusive regime for both the fractal set of sinks and for a single sink.

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“…Entre las técnicas de optimización se tiene el ampliar el rango espectral que puede absorber la célula (células multi-unión, células con bandas intermedias, células con puntos cuánticos), reducir las pérdidas por termalización (células hot-carriers, varios pares electrón-hueco por fotón), adaptar el espectro solar al material receptor (conversión up / down, células termo-fotovoltaicas y termo-fotónicas) a través de capas superpuestas al módulo FV y aumentar la cantidad de luz incidente (concentración fotovoltaica). Al momento de diseñar un modelo teórico de integración tecnológica para sistemas fotovoltaicos (SFV), se deben considerar tópicos referentes a ciencia de materiales (Venneri & Borgia, 2019), modelos de hardware reconfigurable (Sandoval, 2019a) y control de convertidores solares reconfigurables (RSC) para fotovoltaica (Kim, Parkhideh, Bongers & Gao, 2012). Esto con el propósito de optimizar funcionalidades físicas a partir del ordenamiento de estructuras (en relación con los niveles de conversión y fases del material) para la adaptación de sus propiedades y comportamiento a los requerimientos de diseño.…”

Section: Introductionunclassified

Arreglos Fotovoltaicos Inteligentes con Modelo LFSR-Reconfigurable

Ruiz

2020

Ingeniería

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En esta investigación se plantea un modelo de celdas fotovoltaicas reconfigurables y una plataforma de investigación en optimización de conversión solar. El concepto de parque solar, tiene su principal objetivo en la investigación científica de campo. Es por ello que es un espacio para el análisis de tecnologías, el modelo acá propuesto está basado en un esquema reconfigurable, con concatenación de convertidores y realimentación, en el marco de sistemas regenerativos. Se establecieron criterios para la configuración de los dispositivos fotovoltaicos inteligentes IPVDs, soportados por tecnología FPGA. Un arreglo inteligente de paneles solares, de forma distribuidas en el campo solar, realizan la formulación de la composición tándem y síntesis de estructuras reconfigurables. Se describió la red neuronal artificial, en sus funciones específicas de modelado dinámico, control avanzado y esquemas reconfigurables. Se obtiene como resultados el diseño conceptual de la plataforma bajo criterios de sostenibilidad y responsabilidad ambiental, una matriz de códigos para el configuración remota de los elementos y un modelo con arquitectura LFSR para el sistema de convertidores de energías renovables. Todo esto permite aportar en la migración hacia nuevas tecnologías y modelos sostenibles de la matriz energética, con estimación en línea del impacto ambiental y eficiencia de los nuevos desarrollos. Se obtiene como conclusión un concepto tecnológico, que se basa en un modelo fractal desde la física cuántica aplicada al diseño del convertidor fotovoltaico, hasta la estructura generalizada, con capacidad de reconfiguración de las características de sus capas.

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A Dual-Band Compact Metamaterial Absorber with Fractal Geometry

Cited by 25 publications

References 21 publications

An ultra-thin double-functional metasurface patch antenna for UHF RFID applications

An ultra-thin double-functional metasurface patch antenna for UHF RFID applications

Fractional Diffusion to a Cantor Set in 2D

Arreglos Fotovoltaicos Inteligentes con Modelo LFSR-Reconfigurable

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