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Electromagnetic absorber composite made of carbon fibers loaded epoxy foam for anechoic chamber application

Abstract : This paper presents a new electromagnetic absorbing material developed from carbon fibers loaded epoxy foam for an application in anechoic chamber. The composite was developed in order to replace the currently used pyramidal absorbers made of carbon particles loaded polyurethane foam. Epoxy-composites filled with different weight percentages (from 0 wt.% to 4 wt.%) and length (1 and 3 mm) of carbon fibers were achieved. After an optimization of the dispersion of carbon fibers in composite materials, the dielectric properties of the composites were measured using a coaxial-probe in the frequency range 4–18 GHz. Results have shown that the complex permittivity of the composites increases with the amount of charge and also with the length of the carbon fibers. Absorption performance of a prototype prepared with a low concentration (0.5 wt.%) of carbon fibers was measured in an anechoic chamber: it shows a mean gain of 10 dB compared to a commercial absorber. © 2017 Elsevier B.V.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01508052
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Submitted on : Thursday, April 13, 2017 - 4:32:15 PM
Last modification on : Monday, October 5, 2020 - 9:50:25 AM

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C. Méjean, L. Pometcu, Ratiba Benzerga, A. Sharaiha, C. Le Paven-Thivet, et al.. Electromagnetic absorber composite made of carbon fibers loaded epoxy foam for anechoic chamber application. Materials Science and Engineering B: Solid-State Materials for Advanced Technology, Elsevier, 2017, 220, pp.59--65. ⟨10.1016/j.mseb.2017.03.009⟩. ⟨hal-01508052⟩

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