Broadband Electromagnetic Absorbing Structures Made of Graphene/Glass-Fiber/Epoxy Composite

Radar-absorbing structures (RASs) with improved mechanical properties and subwavelength thickness are of particular interest for aerospace applications and electromagnetic (EM) interference control. This article proposes a new RAS, made of a graphene-filled lossy laminate (LL) with impedance adapter...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2020-02, Vol.68 (2), p.590-601
Main Authors: Marra, Fabrizio, Lecini, Julian, Tamburrano, Alessio, Pisu, Luigi, Sarto, Maria Sabrina
Format: Article
Language:English
Subjects:
Absorption
Adapters
Broadband
Composite materials
Computer simulation
Effective medium theory
electromagnetic (EM) absorbers
Frequency ranges
Glass fiber reinforced plastics
Glass-epoxy composites
Graphene
graphene nanoplatelets (GNPs)
Mechanical properties
Radar absorbers
radar-absorbing structures (RASs)
Thickness
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Summary:Radar-absorbing structures (RASs) with improved mechanical properties and subwavelength thickness are of particular interest for aerospace applications and electromagnetic (EM) interference control. This article proposes a new RAS, made of a graphene-filled lossy laminate (LL) with impedance adapter, having a total thickness less than 4 mm and a normalized absorption bandwidth of 84% in the frequency range 6-18 GHz. The RAS is designed by applying an innovative simulation approach of the graphene-filled LL, which is based on the multiscale Maxwell Garnett model and the effective medium theory. Experimental tests are performed in order to validate the developed model and to assess the absorption properties of the produced RAS, having a minimum reflection of -30 dB and an absorption bandwidth at -10 dB of 10 GHz, with a central frequency of 12 GHz and a graphene nanoplatelets concentration less than 5 g/m 2 .
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2019.2950223