Design of Carbon Nanotube-Based Broadband Radar Absorber for Ka-Band Frequency Range

Bychanok, D.; Gorokhov, Gleb; Meisak, Darya; Kuzhir, P.; Maksimenko, S. A.; Wang, Yongliang; Han, Zhidong; Gao, Xin; Yue, and Hongyan

doi:10.2528/pierm16090303

Cited by 15 publications

(13 citation statements)

References 20 publications

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“…We assume that this special feature of GCS-based monolayer may find some practical applications in the future, for example for designing frequency-selective filters. Also noteworthy is that the microwave absorption performances of the GCSs monolayers considered here are generally comparable with those of other absorbers presented recently [16][17][18] (the absorption mechanism is classical Ohmic losses in conductive medium). These recent reports generally deal with materials based on polymer matrix and their operating temperature range is usually limited below 200-300…”

Section: B Air Gap Dependencesupporting

confidence: 57%

“…Generally, the following mechanisms of EM absorption are used for practical a) dzmitrybychanok@ya.ru; www.nano.bsu.by applications: ferromagnetic resonance 10,11 , Ohmic losses 12,13 , dipole relaxation 14 and lossy scattering in metamaterials 15 . At present, many groups focus on the investigation of carbon-based polymer composites for developing effective microwave absorbers [16][17][18] . In this paper, we considered the features of normal scattering of microwave radiation on an ordered monolayer of porous carbon spheres on a Perfect Electrically Conducting (PEC) plate, schematically shown in Fig.1.…”

Section: Introductionmentioning

confidence: 99%

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Fully carbon metasurface: Absorbing coating in microwaves

Bychanok

Gorokhov

et al. 2017

Journal of Applied Physics

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The microwave-absorbing properties of a heterostructure consisting of an ordered monolayer of porous glassy carbon spheres were experimentally and theoretically investigated in the Ka-band (26-37 GHz) frequency range. The electromagnetic response of such "moth-eye"-like all-carbon metasurface at a normal incidence angle was modelled on the basis of long-wave approximation. Modelling parameters in the Ka-band were used to estimate and predict the absorption properties of monolayers in free space in the range 1-40 GHz. Experimental and theoretical results demonstrate that a metasurface based on porous glassy carbon spheres is an inert, lightweight, compact and perfectly absorbing material for designing new effective microwave absorbers in various practically used frequency ranges.

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Section: B Air Gap Dependencesupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Fully carbon metasurface: Absorbing coating in microwaves

Bychanok

Gorokhov

et al. 2017

Journal of Applied Physics

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“…The preparation method of hybrid composites (in our case with two different filler types) does not differ essentially from the dispersion of one filler in a polymer matrix [20,24]. The only difference is the separate dispersion of each inclusion (MWCNT and MnFe 2 O 4 ) in ethanol by using ultrasonic devices (bath and probe during 1h each of them).…”

Section: Methodsmentioning

confidence: 99%

Dielectric Relaxation in the Hybrid Epoxy/MWCNT/MnFe2O4 Composites

et al. 2020

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The electrical properties of epoxy/MWCNT (multi-walled carbon nanotubes)/MnFe2O4 hybrid composites loaded with MWCNTs (below, 0.09 vol.%, and above, 0.58 vol.%, percolation threshold) and varying concentrations of MnFe2O4 up to 10 vol.% were studied in a wide frequency range (20 Hz–40 GHz) at different temperatures (20 K–500 K). At low frequencies, the dielectric permittivity and the electrical conductivity of composites with fixed amounts of MWCNT are strongly dependent on MnFe2O4 content. For MWCNT concentrations above the percolation threshold (i.e., 0.58 vol.%), the electrical conductivity highly decreases with the increase of the MnFe2O4 fraction. In contrast, for the epoxy/MWCNT just below the onset of electrical conductivity (0.09 vol.% of MWCNTs), there exists an optimal concentration of MnFe2O4 inclusions (i.e., 0.025 vol.%), leading to a dramatic increase of the electrical conductivity by three orders of magnitude. The electrical transport in composites is mainly governed by electron tunneling at lower temperatures (below 200 K), and it is highly impacted by the matrix conductivity at higher temperatures (above 400 K). The electrical properties were discussed in terms of the Maxwell–Wagner relaxation and distributions of relaxation times. A non-invasive platform based on dielectric relaxation spectroscopy was proposed for enhancing the synergetic effect coursed by using multiple nanoinclusions in polymer composites just below the percolation threshold.

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“…The integration of separated clusters happen when the concentration of nanotubes approaches a certain critical value. As a result in the system spreading (infinite) cluster is formed, which leads to appearance of the electric contacts between external electrodes in such a compound [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Experimental studies [1] have shown that the conductivity in nanotube polymeric and ceramic matrix materials follows a percolation-like behavior.…”

Section: Introductionmentioning

confidence: 99%

The Optimization at Studying of Electrical Conductivity in the Dielectric Nanocomposites With Disordered Nanotubes

Burlak¹,

Medina-Ángel²

2018

PIER Letters

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Abstract-We study the electrical conductivity of a three-dimensional (3D) nanocomposite with incorporated random carbon nanotubes (CNT). A large length of the remote nanotubes generates a lot of intersections that induce a rather small percolating threshold of the global conductivity in this medium. We simulate such a system by random cylinders placed in a percolating parallelepiped with the use of Monte Carlo method. The conductivity of such a structure is associated with the critical phenomena, where the main transition parameter is defined by the value of the percolation threshold. We calculate the minimal percolating threshold and determine the functional form of the conductivity by the global optimization technique. Such an approach allows studying the details of the electrical conductivity in nanocomposites even at significant level of the percolating fluctuations.

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Design of Carbon Nanotube-Based Broadband Radar Absorber for Ka-Band Frequency Range

Cited by 15 publications

References 20 publications

Fully carbon metasurface: Absorbing coating in microwaves

Fully carbon metasurface: Absorbing coating in microwaves

Dielectric Relaxation in the Hybrid Epoxy/MWCNT/MnFe2O4 Composites

The Optimization at Studying of Electrical Conductivity in the Dielectric Nanocomposites With Disordered Nanotubes

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