Ultra-high conductive graphene assembled film for millimeter wave electromagnetic protection

Song, Rongguo; Jiang, Shaoqiu; Hu, Zelong; Fan, Chi; Li, Peng; Ge, Qi; Mao, Boyang; He, Daping

doi:10.1016/j.scib.2022.03.014

Cited by 16 publications

(14 citation statements)

References 15 publications

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“…The GAF used in this work was produced by applying a secondary high-temperature annealing to improve the conductivity: step1, preparing graphene oxide suspension; step2, roll-coating onto a polyethylene terephthalate; step3, evaporation drying; step4, thermally annealing in Ar atmosphere; step5, rolling and compressing; step6, annealing again under Ar atmosphere; step7, rolling at a pressure of 200 MPa. 29 The GAF with high conductivity of 1.1 × 10 6 S/m is used as the conductive material of the structural layer and the reflective layer. The polymethacrylimide (PMI) foam with a density of 0.05 g/cm 3 and a dielectric constant of 1.05 serves as the dielectric substrate material.…”

Section: Design Of Gaf Abcm Unitmentioning

confidence: 99%

“…[26][27][28] A lot of GAF RF devices have been proposed and have demonstrated that the GAF has a comparable loss level with copper when used in the radio-frequency band. [29][30][31] In our previous work, we designed an ultralight multilayer graphene-based metasurface for specular reflection suppression. 32 The metasurface can achieve dual reflection mechanisms including absorption and random diffusion within the same structure, which result in the backward reflection energy being significantly reduced in the ultrawideband range of 7.5-43 GHz.…”

Section: Introductionmentioning

confidence: 99%

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An anisotropic broadband coding metasurface based on ultralight graphene‐assembled film

Luo,

Zu,

Song

et al. 2023

Micro & Optical Tech Letters

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As theoretical research further develops, coding metasurfaces have been widely studied and applied due to their uniqueness in digital characterization and sequence arrangement. In this work, based on highly conductive graphene‐assembled film (GAF), an ultralight anisotropic broadband coding metasurface (ABCM) is proposed. The GAF ABCM consists of 16 units with specific phase responses and enables complete metal substitution. By arranging the unit cells in a specific order, the GAF ABCM realizes the functions of anomalous reflection, polarization conversion, and radar cross‐section (RCS) reduction. Results validate that the GAF ABCM has a measured 10 dB normal incidence backward RCS reduction within the working frequency band of 7–18 GHz, which fully covers the X‐band and Ku‐band for radar application. Furthermore, due to the lightweight property of GAF, the density of the GAF ABCM is only 0.06 g/cm3 (surface mass density of 0.038 g/cm2). All results indicate that the lightweight GAF metasurface is promising in radar stealth and communication fields.

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Section: Design Of Gaf Abcm Unitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An anisotropic broadband coding metasurface based on ultralight graphene‐assembled film

Luo,

Zu,

Song

et al. 2023

Micro & Optical Tech Letters

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“…MXenes possess a high electrical conductivity and graphene has a good chemical stability. In [ 31 ], the conductivity of the graphene assembled film (GAF) is improved by applying a high temperature annealing process. Graphene-based conductors with larger sizes and areas increase the electrical conductivity of the conducting material [ 32 ].…”

Section: Materials For a Flexible Antennamentioning

confidence: 99%

Flexible Antennas for a Sub-6 GHz 5G Band: A Comprehensive Review

John

Vincent

Pathan

et al. 2022

Sensors

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The ever-increasing demand and need for high-speed communication have generated intensive research in the field of fifth-generation (5G) technology. Sub-6 GHz 5G mid-band spectrum is the focus of the researchers due to its meritorious ease of deployment in the current scenario with the already existing infrastructure of the 4G-LTE system. The 5G technology finds applications in enormous fields that require high data rates, low latency, and stable radiation patterns. One of the major sectors that benefit from the outbreak of 5G is the field of flexible electronics. Devices that are compact need an antenna to be flexible, lightweight, conformal, and still have excellent performance characteristics. Flexible antennas used in wireless body area networks (WBANs) need to be highly conformal to be bent according to the different curvatures of the human body at different body parts. The specific absorption rate (SAR) must be at a permissible level for such an antenna to be suited for WBAN applications. This paper gives a comprehensive review of the current state of the art flexible antennas in a sub-6 GHz 5G band. Furthermore, this paper gives a key insight into the materials for a flexible antenna, the parameters considered for the design of a flexible antenna for 5G, the challenges for the design, and the implementation of a flexible antenna for 5G.

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“…[1] Curved surface circuits have the unique ability to conform to curved surfaces while DOI: 10.1002/admt.202300295 retaining the electronic functions of planar integrated circuits. [2] Conformal integration of multifunctional electronic systems on complex curved surfaces enables electronic devices to be more widely used in complex and changeable scenarios, which is of great significance for applications such as health monitoring, [3] environment perception, [4] frequency selective surface, [5] aircraft intelligent sensing skin, [6] stealth electromagnetic functional structure, [7] and curved conformal antenna. [8] At present, the manufacturing technology of curved circuits can be broadly divided into two categories: one is direct manufacturing, wherein functional conductive materials, devices, or components are directly manufactured onto a curved surface; the other is indirect manufacturing, wherein a flexible substrate is used to transfer flat electronic devices onto the curved surface or flat electronic devices are placed under external stimulation from heat, light, magnetism, etc.…”

Section: Introductionmentioning

confidence: 99%

“…[ 1 ] Curved surface circuits have the unique ability to conform to curved surfaces while retaining the electronic functions of planar integrated circuits. [ 2 ] Conformal integration of multifunctional electronic systems on complex curved surfaces enables electronic devices to be more widely used in complex and changeable scenarios, which is of great significance for applications such as health monitoring, [ 3 ] environment perception, [ 4 ] frequency selective surface, [ 5 ] aircraft intelligent sensing skin, [ 6 ] stealth electromagnetic functional structure, [ 7 ] and curved conformal antenna. [ 8 ]…”

Section: Introductionmentioning

confidence: 99%

Direct Manufacturing Technology for High‐Precision Follow‐the‐Shape Circuits on Complex, Hard, Curved Surfaces

Wang

Sha

et al. 2023

Adv Materials Technologies

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Abstract3D curved electronics are a trend in the microelectronics industry, but conformal printing of circuits on complex curved surfaces remains challenging, especially for electronics comprising concave surfaces with large curvature. In this study, a new manufacturing method is proposed for follow‐the‐shape circuits, using high‐precision direct printing technology to print circuits on hard, arbitrarily curved surfaces. A circuit with any complex curved surface can be directly digitized and programmed for fully autonomous and controlled printing without indirect transfer or pad printing processing. The proposed direct printing method begins with using unique 3D projection technology to map a 2D planar functional circuit onto a 3D digital curved surface. The next step is directly printing the integrated circuit on a complex surface by controlled planning of the spatial motion trajectory, high‐frequency drive control of the precision nozzle, and precise switching control of the heterogeneous functional material. Optimal printing parameters are obtained by exploring the main factors affecting molding quality and electrical conductivity of curved surface circuits. Simple examples, such as an acoustic‐optic touch time‐delay three‐control multifunction system, demonstrate the feasibility and broad potential of the proposed technology.

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Ultra-high conductive graphene assembled film for millimeter wave electromagnetic protection

Cited by 16 publications

References 15 publications

An anisotropic broadband coding metasurface based on ultralight graphene‐assembled film

An anisotropic broadband coding metasurface based on ultralight graphene‐assembled film

Flexible Antennas for a Sub-6 GHz 5G Band: A Comprehensive Review

Direct Manufacturing Technology for High‐Precision Follow‐the‐Shape Circuits on Complex, Hard, Curved Surfaces

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