Research Progress on Nanostructured Radar Absorbing Materials

Wang, Yanmin; Li, Tingxi; Zhao, Lifen; Hu, Zuwang; Gu, Yijie

doi:10.4236/epe.2011.34072

Cited by 58 publications

(37 citation statements)

References 21 publications

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“…Ferrites, while having shown considerable magnetic loss and absorbing capabilities, are limited to static and permanent applications due their high density and difficulty in forming them into complex structures [13]. The application of ICPs is hindered by their poor magnetic loss and narrow absorption bandwidth [14] while carbon-based shielding materials suffer from relatively complex and costly fabrication process [15]. To overcome the aforementioned problems, researchers have since developed hybrid materials that combine several shielding materials to offset respective limitation of the materials while still retaining its enhanced shielding properties.…”

Section: Introductionmentioning

confidence: 99%

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Zahari¹,

Guan²,

Cheng³

et al. 2016

PIER M

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Abstract-An electromagnetic interference (EMI) shielding material based on the composite of BaFe 12 O 19 , polyaniline (PANI) and multi-walled carbon nanotube (MWCNT) was proposed. The constituents of the composite were brought together through mechanical mixing and the in-situ polymerization of aniline on the BaFe 12 O 19 and MWCNT surfaces. A series of composite with different MWCNT wt% loadings (0, 5, 10, 15, 20 and 25wt%) was prepared, and its effect on the EMI shielding performance was investigated. X-ray diffraction analysis was performed on all synthesized composites to confirm the phase formations. FESEM micrographs reveal the PANI particle formation on both BaFe 12 O 19 and MWCNT surfaces. Electromagnetic measurements were done by using a rectangular waveguide connected to a network analyser to obtain the permeability, μ r , permittivity, ε r , and shielding effectiveness (SE A and SE R ). The increase in the MWCNT loading results in the enhancement of the composite's shielding performance to a certain limit. Optimum EMI shielding performance is shown by sample PBM4 (20wt% MWCNT) with SE R and SE A values of 5.14 dB at 8.2 GHz and 36.41 dB at 12.4 GHz, respectively. The influence of different MWCNT loadings (0, 5, 10, 15, 20 and 25wt%) on the EMI shielding performance of a composite consisting of BaFe 12 O 19 , polyaniline (PANI) and multi-walled carbon nanotube (MWCNT) were investigated.

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Section: Introductionmentioning

confidence: 99%

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Zahari¹,

Guan²,

Cheng³

et al. 2016

PIER M

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“…The material consists of spherical closed carbon shells, which have concentric layered topology alike that of an onion. OLC materials can depict as shell fullerenes with certain important electrophysical behaviors as a very small weight, a higher specific surface area and adhesion properties and thermal stability [2][3][4][5]. The material can have the higher conductivity and capacitive performances and also possess the high EM shielding properties.…”

Section: Introductionmentioning

confidence: 99%

“…OLC materials can be used as the radar-absorbing material, as components of magnetic recording systems, magnetic fluids. The material also is using in the applications as fuel cells, optical limiting devices [4][5][6][7]. There are broad prospects for developing a variety of devices on the base of OLC materials [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic field and dispersion characteristic analysis of absorbing onion-like carbon tube waveguides

et al. 2014

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Here, we present our calculation results of the electromagnetic field distributions and the dispersion characteristics of open cylindrical tube waveguides. The analyzed waveguides are made of the onion-like carbon (OLC) material. The solution of the boundary problem was fulfilled by the partial area method (Nickelson et al. in electrodynamical analysis of open lossy metamaterial waveguide and scattering structures. InTech, UK, pp 27-58[1]). We have determined the complex roots of the dispersion equation using of the Muller method. It discovered the very complicated dependencies of the phase and attenuation constants on the waveguide radii. Such dependencies arise because the OLC material is the highly dispersive and absorbing one. We have investigated the high-frequency cutoff frequency of the propagating hybrid modes HE 11 and HE 12 dependent on the tube waveguide external and internal radii. We found that it is possible to reach the one-mode regime of OLC tube waveguide.

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“…This, combined with the significantly larger value of its permittivity over other carbon allotropes makes MWCNT particularly appealing for EMI shielding applications. Despite this, the complex and costly fabrication process limits the widespread usage of MWCNT as a single shielding material [7]. A relatively cheaper supplementary component would be the family of conducting polymers.…”

Section: Introductionmentioning

confidence: 99%

Development and Evaluation of Bafe12o19-Pani-MWCNT Composite for Electromagnetic Interference (Emi) Shielding

Zahari¹,

Guan²,

Cheng³

2018

PIER C

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Abstract-The salient individual properties of BaFe 12 O 19 , MWCNT, and PANI show promise in exhibiting excellent electromagnetic interference (EMI) shielding when they are combined. This research work focuses on developing a composite consisting of all three materials through a simple polymerization process and then evaluating its potential EMI shielding behaviour through electromagnetic measurements. The composite formation was morphologically and structurally verified through XRD, FTIR and FESEM measurements. The presence of main functional groups characteristic to PANI in the composite samples as shown by its FTIR spectra indicates its successful preparation through this method while FESEM micrographs show the random distribution of the composite constituents. The composite is conductive in nature with values reaching as high as 12.43 S/m for the composite with the highest MWCNT wt% (BPM 1 3 25). Electromagnetic measurements done at the X-band show promising EMI shielding behaviour in all prepared composites. The overall highest SE A values are shown by sample BPM 1 3 25 with a minimum shielding value of 65 dB throughout the whole frequency band, far exceeding that of pure MWCNT.

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Research Progress on Nanostructured Radar Absorbing Materials

Cited by 58 publications

References 21 publications

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Electromagnetic field and dispersion characteristic analysis of absorbing onion-like carbon tube waveguides

Development and Evaluation of Bafe12o19-Pani-MWCNT Composite for Electromagnetic Interference (Emi) Shielding

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