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Theses

Élaboration de nouveaux matériaux absorbants : application en chambres anéchoïques

Abstract : This thesis work focused on the study of new materials for electromagnetic absorption in anechoic chambers. This subject arose from the study of a new matrix which was never used for electromagnetic absorbers until then: the epoxy foam. This foam has many advantages compared to the matrices usually used in the trade like the possibility of cutting complex shapes out of them or trapping the charge in the core of the absorber...This matrix was associated to different carbonaceous load (carbon black, graphite and carbon fibers). The combination of epoxy foam with millimeter carbon fibers has shown better absorption performance at very low loading rates: 0.5 %wt (S11 ≈ -40 dB between 4 and 18 GHz under normal and oblique incidences). The use of different fiber lengths showed that it is possible to improve absorption performance at low frequencies using long carbon fibers. Finally, we directed our work on the creation of an absorbent material from a cork matrix. These new materials, made from bio-based materials, have shown better absorption performance than a commercial absorber, with the same dimensions in normal incidence (S11 = -54 dB and S11 = - 27 dB respectively at 4.26 GHz) and oblique incidence (S11 = -51 dB and S11 = -30 dB respectively at 4.26 GHz) and are therefore potential candidates for the replacement of existing commercial absorbent materials.
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Submitted on : Thursday, August 20, 2020 - 9:58:25 AM
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  • HAL Id : tel-02917990, version 1

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Chloé Méjean. Élaboration de nouveaux matériaux absorbants : application en chambres anéchoïques. Electronique. Université Rennes 1, 2017. Français. ⟨NNT : 2017REN1S153⟩. ⟨tel-02917990⟩

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