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Investigation of Microwave Absorption Mechanisms in Microcellular Foamed Conductive Composites

ICTEAM Institute, Université Catholique de Louvain, Place du Levant 3, 1348 Louvain-la-Neuve, Belgium
Academic Editor: Eiichi Tamiya
Received: 31 May 2021 / Revised: 7 July 2021 / Accepted: 18 July 2021 / Published: 26 July 2021
(This article belongs to the Section Microscale Materials Science)
The paper investigates the mechanisms of microwave absorption in microcellular foamed conductive composites dedicated to protection against electromagnetic interferences (EMI). A multi-layered electromagnetic one-dimensional (1D) model mimicking the microcellular foam structure is built and validated using previous measurements carried out on various fabricated composite foams. Our model enables us to perform a parametric analysis of the absorption behaviour in a foamed composite, using as parameters the size of the hollow cell, the thickness of the cell’s walls and its conductivity, as well as the overall thickness of the composite and the frequency. Our investigations demonstrate that multiple reflections of the microwave signal between the cellular walls are not the main mechanism responsible for absorption, although they are often reported as a cause of enhanced absorption in the literature. On the contrary, our work demonstrates that the enhancement of the absorption observed in foamed conductive composite compared to unfoamed composite is mainly due to the presence of air in the microcells of the composite. View Full-Text
Keywords: modelling; simulation; microcellular; foam; conductive composite; microwave absorption modelling; simulation; microcellular; foam; conductive composite; microwave absorption
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MDPI and ACS Style

Huynen, I. Investigation of Microwave Absorption Mechanisms in Microcellular Foamed Conductive Composites. Micro 2021, 1, 86-101. https://0-doi-org.brum.beds.ac.uk/10.3390/micro1010007

AMA Style

Huynen I. Investigation of Microwave Absorption Mechanisms in Microcellular Foamed Conductive Composites. Micro. 2021; 1(1):86-101. https://0-doi-org.brum.beds.ac.uk/10.3390/micro1010007

Chicago/Turabian Style

Huynen, Isabelle. 2021. "Investigation of Microwave Absorption Mechanisms in Microcellular Foamed Conductive Composites" Micro 1, no. 1: 86-101. https://0-doi-org.brum.beds.ac.uk/10.3390/micro1010007

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