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Special Issue "Electromagnetic Wave Absorbing Structures"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 July 2018

Special Issue Editors

Guest Editor
Prof. Mario Marchetti

Department of Astronautic Electric and Energy Engineering, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy
Website | E-Mail
Interests: materials science; aerospace structures.
Guest Editor
Dr. Davide Micheli

Department of Wireless Access Engineering, Telecom Italia S.P.A, Viale Parco de' Medici, 61-00148 Rome, Italy
Website | E-Mail
Interests: radar absorbing structures; electromagnetic weave propagation in lossy media; mobile telecommunications technologies; material science.

Special Issue Information

Dear Colleagues,

Electromagnetic Wave Absorbing Structures are becoming an important topic in most technologies and environments where the main focus is to reduce the level of electromagnetic fields in certain places or systems. In particular, they are employed in reducing radar signature and/or the power density of electromagnetic interference in defence, telecommunication, medical systems, laboratory environments, and in human health care and public safety issues too. In systems where electromagnetic shielding effectiveness need to be improved, absorbing materials play a central role in lower down the amount of reflected and transmitted electromagnetic waves. Typically, the lower the frequency the harder to build effective absorbers at the cost of increased final thickness. Nowadays, some research on electromagnetic wave absorbers is focused on monolayer structures, whereas others make use of layered structures. Recently, these last have also been successfully applied to mimic reflection coefficient profiles, a priori established in metrology and defense technologies. Research works currently span electric and magnetic properties of materials to improve electromagnetic wave absorbing capabilities. In such a contest, most studies make use composites made with carbon nanoparticles. Other research is focused on foamed structures.

We invite full papers, communications, and reviews that cover one or several of the listed keywords below.

Prof. Mario Marchetti
Dr. Davide Micheli
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Electromagnetic wave absorbers based on composites and thermoplastic materials
  • Electromagnetic wave absorbers based on foam structures
  • Electromagnetic wave absorbers based on nanoparticles
  • Electromagnetic wave absorbers based on multilayer structures
  • Electromagnetic wave absorbers based on fibrous structures

Published Papers (2 papers)

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Research

Open AccessArticle Structure and Electromagnetic Properties of Cellular Glassy Carbon Monoliths with Controlled Cell Size
Materials 2018, 11(5), 709; https://doi.org/10.3390/ma11050709
Received: 4 April 2018 / Revised: 24 April 2018 / Accepted: 28 April 2018 / Published: 1 May 2018
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Abstract
Electromagnetic shielding is a topic of high importance for which lightweight materials are highly sought. Porous carbon materials can meet this goal, but their structure needs to be controlled as much as possible. In this work, cellular carbon monoliths of well-defined porosity and
[...] Read more.
Electromagnetic shielding is a topic of high importance for which lightweight materials are highly sought. Porous carbon materials can meet this goal, but their structure needs to be controlled as much as possible. In this work, cellular carbon monoliths of well-defined porosity and cell size were prepared by a template method, using sacrificial paraffin spheres as the porogen and resorcinol-formaldehyde (RF) resin as the carbon precursor. Physicochemical studies were carried out for investigating the conversion of RF resin into carbon, and the final cellular monoliths were investigated in terms of elemental composition, total porosity, surface area, micropore volumes, and micro/macropore size distributions. Electrical and electromagnetic (EM) properties were investigated in the static regime and in the Ka-band, respectively. Due to the phenolic nature of the resin, the resultant carbon was glasslike, and the special preparation protocol that was used led to cellular materials whose cell size increased with density. The materials were shown to be relevant for EM shielding, and the relationships between those properties and the density/cell size of those cellular monoliths were elucidated. Full article
(This article belongs to the Special Issue Electromagnetic Wave Absorbing Structures)
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Open AccessArticle Effect of Aspect Ratio on the Permittivity of Graphite Fiber in Microwave Heating
Materials 2018, 11(1), 169; https://doi.org/10.3390/ma11010169
Received: 21 November 2017 / Revised: 11 January 2018 / Accepted: 17 January 2018 / Published: 22 January 2018
PDF Full-text (3083 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Microwave (MW) heating has received attention as a new heating source for various industrial processes. Some materials are expected to be a more effective absorber of MW, and graphite is observed as a possible candidate for high-temperature application. We investigated the dependence of
[...] Read more.
Microwave (MW) heating has received attention as a new heating source for various industrial processes. Some materials are expected to be a more effective absorber of MW, and graphite is observed as a possible candidate for high-temperature application. We investigated the dependence of the aspect ratio of graphite fibers on both their heating behavior and permittivity under a 2.45 GHz MW electric field. In these experiments, both loss tangent and MW heating behavior indicated that the MW absorption of conductive fibers increases with their aspect ratio. The MW absorption was found to be well accounted for by the application of a spheroidal model for a single fiber. The absorption of graphite fibers decreases with increasing aspect ratio when the long axis of the ellipsoid is perpendicular to the electric field, whereas it increases with the aspect ratio when the long axis is parallel to the electric field. The analytical model indicated that MW heating of the conductive fibers is expected to depend on both the shape and arrangement of the fibers in the electric field. Full article
(This article belongs to the Special Issue Electromagnetic Wave Absorbing Structures)
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