Abstract In this paper, we present the design of nanostructured multilayer absorbers, carried out with the aid of a genetic algorithm (GA). Waveguide measurements are performed to recover the dielectric properties of micrographite single-walled carbon nanotube, micrographite walled carbon nanotube, carbon nanofiber, and fullerene-based composite materials. Conductive fillers are uniformly dispersed in an epoxy resin at different weight percentages (1, 3, 5 wt.%). The electromagnetic (EM) analysis is performed embedding the forward/backward propagation matrix formalism in an in-house GA, thus able to carry out optimization upon oblique incidence over a finite angular range. Developed code minimizes both the reflection and the transmission coefficients under the thickness minimization constraint. Comparison between micrographite and nanopowders absorbers is presented and discussed, when a broadband quasi-perfect absorber is achieved among the X-band combining the two filler families, i.e., exhibiting a loss factor greater than 90% in most of the band, for a thickness of about 1 cm. It is demonstrated that the nanofillers with higher aspect ratio mainly contribute to the EM absorption. Findings are of interest in both radar-absorbing material and shielding structures.

Broadband Electromagnetic Absorbers Using Carbon Nanostructure-Based Composites / Micheli, Davide; Pastore, Roberto; Apollo, Carmelo; Marchetti, Mario; G., Gradoni; V., Mariani Primiani; F., Moglie. - In: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES. - ISSN 0018-9480. - ELETTRONICO. - 59:10(2011), pp. 2633-2646. [10.1109/TMTT.2011.2160198]

Broadband Electromagnetic Absorbers Using Carbon Nanostructure-Based Composites

MICHELI, DAVIDE;PASTORE, Roberto;APOLLO, CARMELO;MARCHETTI, Mario;
2011

Abstract

Abstract In this paper, we present the design of nanostructured multilayer absorbers, carried out with the aid of a genetic algorithm (GA). Waveguide measurements are performed to recover the dielectric properties of micrographite single-walled carbon nanotube, micrographite walled carbon nanotube, carbon nanofiber, and fullerene-based composite materials. Conductive fillers are uniformly dispersed in an epoxy resin at different weight percentages (1, 3, 5 wt.%). The electromagnetic (EM) analysis is performed embedding the forward/backward propagation matrix formalism in an in-house GA, thus able to carry out optimization upon oblique incidence over a finite angular range. Developed code minimizes both the reflection and the transmission coefficients under the thickness minimization constraint. Comparison between micrographite and nanopowders absorbers is presented and discussed, when a broadband quasi-perfect absorber is achieved among the X-band combining the two filler families, i.e., exhibiting a loss factor greater than 90% in most of the band, for a thickness of about 1 cm. It is demonstrated that the nanofillers with higher aspect ratio mainly contribute to the EM absorption. Findings are of interest in both radar-absorbing material and shielding structures.
2011
01 Pubblicazione su rivista::01a Articolo in rivista
Broadband Electromagnetic Absorbers Using Carbon Nanostructure-Based Composites / Micheli, Davide; Pastore, Roberto; Apollo, Carmelo; Marchetti, Mario; G., Gradoni; V., Mariani Primiani; F., Moglie. - In: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES. - ISSN 0018-9480. - ELETTRONICO. - 59:10(2011), pp. 2633-2646. [10.1109/TMTT.2011.2160198]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/433175
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