A Dynamically Tunable Microwave Absorber Based on Graphene

Geng, Ming‐Yang; Liu, Zhenguo; Wu, Weijun; Chen, Hao; Wu, Bian; Lu, Wei‐Bing

doi:10.1109/tap.2020.2972646

Cited by 46 publications

(30 citation statements)

References 36 publications

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“…In addition to integration of graphene with active resonators to achieve dual functions of frequency shift and amplitude modulation, the structured graphene with subwavelength patterns is another effective solution to solely realize the dynamic modulation of absorption frequency. Geng et al [74] proposed a dynamic gigahertz-band frequency tunable absorber based on a patterned graphene metasurface. By applying external bias voltage, the proposed absorber achieves the continuous shift of the central frequency from 13.9 to 16.4 GHz, while maintaining high absorption over 92%.…”

Section: Frequency-shifted Absorbersmentioning

confidence: 99%

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Graphene‐Based Microwave Metasurfaces and Radio‐Frequency Devices

Zhang

Zhu

2021

Advanced Photonics Research

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Graphene, as a 2D material, has attracted significant attention due to its particular electronic band structure and unique physical properties. Metasurfaces integrated with graphene hold great promise for dynamic manipulation of the electromagnetic waves, where metasurfaces with strong resonances enhance the interaction with incident waves and in turn facilitate a deep modulation through electrical doping of graphene. However, the tunable surface conductivity of graphene is very frequency dependent that makes graphene behave significantly different in THz and microwave band. Due to the novel tuning method of graphene–electrolyte‐based sandwich structures, experimental studies of tunable microwave metadevices have aroused wide interests in the past few years. Herein, the recent progress of graphene‐based microwave metasurfaces and related devices, involved but not limited to tunable absorbers, dynamic beam steering, reconfigurable antennas, and attenuators, are reviewed, enriching the experimental developments of graphene in the microwave region.

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Section: Frequency-shifted Absorbersmentioning

confidence: 99%

Section: Graphene-based Beam Steeringmentioning

confidence: 99%

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Graphene‐Based Microwave Metasurfaces and Radio‐Frequency Devices

Zhang

Zhu

2021

Advanced Photonics Research

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“…Various types of graphene-based absorbers have been proposed in the past decade through applying ferrite-graphene based magnetic materials [28] and monolayer/multilayer graphene [29]- [32]. Recently, with the development of printed electronics, printable conductive inks [33] have been used to replace conventional conductors in metamaterial absorber designs [34]- [38] due to their extraordinary characteristics in mechanical flexibility and lightweight.…”

Section: Introductionmentioning

confidence: 99%

Controlling Graphene Sheet Resistance for Broadband Printable and Flexible Artificial Magnetic Conductor-Based Microwave Radar Absorber Applications

Fang¹,

Pan

Leng

et al. 2021

IEEE Trans. Antennas Propagat.

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Current artificial magnetic conductor (AMC) designs use metallic patterns on rigid substrates and focus on shapes and sizes of AMC structures, rather than on material performance, which has hindered operation bandwidth and design flexibility. Here, we introduce printed graphene AMCbased broadband and flexible microwave radar absorbers, which not only redirect but also absorb the incident wave so to broaden the operation bandwidth. Contrasting to other reported works, the phase characteristics of the AMCs are realized through the control of the surface resistance provided by printed graphene laminates. We produced a variety of AMC structures, composed of printed graphene circular ring arrays with exactly the same shape and size, but different sheet resistances. By carefully designing the sheet resistance of printed graphene laminates, the optimized anti-phase reflection cancellation between AMCs can be achieved. With printed graphene AMCs and flexible dielectric substrate, the absorber presented in this work has a broadband effective absorption (above 90% absorptivity) from 7.58 GHz to 18 GHz, is polarization insensitive under normal incident and can work at relatively wide incident angles. Furthermore, this absorber is capable of bending easily with notable performance, which makes it ideal for applications with irregular and uneven shapes.

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“…Graphene, as a two-dimensional material, has outstanding tunable EM properties, which is widely used in the design of absorbers. Not only the current research on graphene-based tunable absorbers is focused on the above-THz band [19][20][21][22][23] but also studies in the microwave band are increasing, such as amplitude tuning, [24][25][26][27] frequency tuning, 28,29 and frequency-amplitude tuning. 30 In Refs.…”

mentioning

confidence: 99%

Angularly tunable perfect absorption in graphene-mushroom hybrid structure for all angles

Xue

Zhong

Wang

et al. 2021

Applied Physics Letters

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In this work, the authors propose a graphene-based tunable perfect metamaterial absorber at microwaves that can achieve perfect absorption at all angles. This is realized by stacking an unpatterned graphene sandwich structure and a dielectric layer on top of a mushroom-type high impedance surface whose resonant frequency is stable for all angles of incidence. A perfect-absorption-angle tunable absorber working at TM polarization is designed and realized, achieving perfect absorption covering a wide range of angles from normal to grazing incidence at the same frequency when the impedance of graphene is modulated by different bias voltages. The design concept of integrating different tunable materials and meta-structures opens up promising possibilities for wave manipulation with applications in smart and multifunctional electromagnetic devices.

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A Dynamically Tunable Microwave Absorber Based on Graphene

Cited by 46 publications

References 36 publications

Graphene‐Based Microwave Metasurfaces and Radio‐Frequency Devices

Graphene‐Based Microwave Metasurfaces and Radio‐Frequency Devices

Controlling Graphene Sheet Resistance for Broadband Printable and Flexible Artificial Magnetic Conductor-Based Microwave Radar Absorber Applications

Angularly tunable perfect absorption in graphene-mushroom hybrid structure for all angles

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