A new triple-layered composite for high-performance broadband microwave absorption

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We report a novel, triple-layered composite composed of multi-walled nanotubes (MWNTs) dispersed in an epoxy/cotton fabric resistive layer that is sandwiched between two MWNT-dispersed E-glass fiber/epoxy dielectric absorbing layers. This structure efficiently absorbs microwave radiation over a frequency range of 2-18 GHz. This layered, composite structure is thin relative to previously developed, multi-layer systems with a resistive layer/low dielectric layer/resistive layer/low-dielectric layer structure. The paper-like resistive layer facilitates broadband microwave absorption by matching the impedance between the two absorbing layers. The E-glass fiber/epoxy laminate composites provide structural and mechanical support. The conductive MWNT filler controls dielectric losses through the formation of a network that allows high complex permittivity at low concentrations. Free-space measurements showed that the resulting triple-layered structure boasts an outstandingly broad bandwidth of reflection loss below -10 dB from 4.7 to 13.7 GHz. This new multi-layer structure offers a promising solution for attenuating electromagnetic waves over broad frequency ranges.
Publisher
ELSEVIER SCI LTD
Issue Date
2015-04
Language
English
Article Type
Article
Keywords

ABSORBING PROPERTIES; POLYMER COMPOSITES; CONDUCTING POLYMER; X-BAND; PERMITTIVITY; DESIGN; FILMS

Citation

COMPOSITE STRUCTURES, v.122, pp.166 - 171

ISSN
0263-8223
DOI
10.1016/j.compstruct.2014.11.020
URI
http://hdl.handle.net/10203/195518
Appears in Collection
CBE-Journal Papers(저널논문)
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