Ultra‐Broadband and Wide‐Angle Metamaterial Absorber with Carbon Black/Carbonyl Iron Composites Fabricated by Direct‐Ink‐Write 3D Printing

Zhang, Zhe; Wang, Fei; Zhang, Jiliang; Li, Peifeng; Jiang, Kaiyong

doi:10.1002/adem.202201236

Cited by 7 publications

(3 citation statements)

References 45 publications

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“…The exchange resonances mainly occur above 10 GHz. The formula for the eddy current loss is as follows [ 34 ]:

where

is the eddy current loss factor;

and

are the real and imaginary parts of permeability; and

, and

are the frequency, vacuum permeability, dielectric constant, and particle thickness, respectively. According to the formula, if the magnetic loss is mainly caused by eddy current loss,

should be a constant that does not change with frequency.…”

Section: Resultsmentioning

confidence: 99%

“…The exchange resonances mainly occur above 10 GHz. The formula for the eddy current loss is as follows [34]: Generally, magnetic loss mainly comes from hysteresis loss, domain wall resonance, natural resonance, exchange resonance, and eddy current loss. The domain wall resonances mainly occur in the MHz range.…”

mentioning

confidence: 99%

“…The exchange resonances mainly occur above 10 GHz. The formula for the eddy current loss is as follows [34]:…”

mentioning

confidence: 99%

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Effect of Ball-Milling Process on Microwave Absorption Behaviors of Flaky Carbonyl Iron Powders

et al. 2023

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Electromagnetic (EM) wave absorption performance is greatly affected by the microscopic morphology of the absorbing material particles. In this study, a facile and efficient ball-milling method was applied to increase the aspect ratio of particles and prepare flaky carbonyl iron powders (F-CIPs), one of the most readily commercially available absorbing materials. The effect of ball-milling time and rotation speed on the absorption behaviors of the F-CIPs was investigated. The microstructures and compositions of the F-CIPs were determined using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The EM parameters were measured using a vector network analyzer (VNA) in the frequency range of 2–18 GHz. The results indicated that the ball-milled flaky CIPs exhibited a better absorption ability than the raw spherical CIPs. Among all the samples, the sample milled at 200 r/min for 12 h and the sample milled at 300 r/min for 8 h showed remarkable EM parameters. The ball-milling sample with 50 wt.% F-CIPs had a minimum reflection loss peak of −14.04 dB at a thickness of 2 mm and a maximum bandwidth (RL < −7 dB) of 8.43 GHz at a thickness of 2.5 mm, a result that conformed with the transmission line theory. Hence, the ball-milled flaky CIPs were considered to be beneficial for microwave absorption.

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“…The exchange resonances mainly occur above 10 GHz. The formula for the eddy current loss is as follows [ 34 ]:

where

is the eddy current loss factor;

and

are the real and imaginary parts of permeability; and

, and

are the frequency, vacuum permeability, dielectric constant, and particle thickness, respectively. According to the formula, if the magnetic loss is mainly caused by eddy current loss,

should be a constant that does not change with frequency.…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Effect of Ball-Milling Process on Microwave Absorption Behaviors of Flaky Carbonyl Iron Powders

et al. 2023

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Multi‐Scale Dispersion Engineering on Biomass‐Derived Materials for Ultra‐Wideband and Wide‐Angle Microwave Absorption

Tan,

Liu,

et al. 2024

Small Methods

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Efficient electromagnetic waves (EMWs) absorbing materials play a vital role in the electronic era. In traditional research on microwave absorbing (MA) materials, the synergistic modulation of material dispersion and structural dispersion of EMWs by incorporating multi‐scale effects has frequently been overlooked, resulting in an untapped absorption potential. In this study, the material dispersion customization method based on biomass carbon is determined by quantitative analysis. The study carries out thermodynamic modulation of carbon skeleton, micro‐nano porous engineering, and phosphorus atom donor doping in turn. The dielectric properties are improved step by step. In terms of structural dispersion design, inspired by the theory of antenna reciprocity, a Vivaldi antenna‐like absorber is innovatively proposed. With the effective combination of material dispersion and structural dispersion engineering by 3D printing technology, the ultra‐wideband absorption of 36.8 GHz and the angular stability of close to 60 ° under dual polarization are successfully realized. The work breaks the deadlock of mutual constraints between wave impedance and attenuation rate through the dispersion modulation methods on multiple scales, unlocking the potential for designing next‐generation broadband wide‐angle absorbers.

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Direct ink writing printed flexible double-layer staggered woodpile structure for multi-band compatible absorption of gigahertz and terahertz waves

Liu,

Shi,

et al. 2023

Chemical Engineering Journal

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Ultra‐Broadband and Wide‐Angle Metamaterial Absorber with Carbon Black/Carbonyl Iron Composites Fabricated by Direct‐Ink‐Write 3D Printing

Cited by 7 publications

References 45 publications

Effect of Ball-Milling Process on Microwave Absorption Behaviors of Flaky Carbonyl Iron Powders

Effect of Ball-Milling Process on Microwave Absorption Behaviors of Flaky Carbonyl Iron Powders

Multi‐Scale Dispersion Engineering on Biomass‐Derived Materials for Ultra‐Wideband and Wide‐Angle Microwave Absorption

Direct ink writing printed flexible double-layer staggered woodpile structure for multi-band compatible absorption of gigahertz and terahertz waves

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