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Ultra-Wideband Flexible Absorber in Microwave Frequency Band

In this paper, an ultra-wideband flexible absorber is proposed. Based on a summary of the absorption mechanism, using lossless air to replace the heavy lossy dielectric layer will not substantially impact the absorption. The dielectric layer is only a thin layer of polyimide. The proposed absorber i...

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Detalles Bibliográficos
Autores principales: Fan, Shicheng, Song, Yaoliang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7662404/
https://www.ncbi.nlm.nih.gov/pubmed/33143266
http://dx.doi.org/10.3390/ma13214883
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author Fan, Shicheng
Song, Yaoliang
author_facet Fan, Shicheng
Song, Yaoliang
author_sort Fan, Shicheng
collection PubMed
description In this paper, an ultra-wideband flexible absorber is proposed. Based on a summary of the absorption mechanism, using lossless air to replace the heavy lossy dielectric layer will not substantially impact the absorption. The dielectric layer is only a thin layer of polyimide. The proposed absorber is a sandwich structure. The surface is a layer of copper metal ring and wire, and it is loaded with chip resistors to expand the absorber bandwidth. Simulated results show that the bandwidth of the proposed absorber, with an absorptivity of more than 90%, is 2.55–10.07 GHz, with a relative bandwidth over 119.2%. When the electromagnetic wave has a wide incident angle, the absorber still maintains a high absorption. This absorber has been fabricated by FPC (flexible printed circuit) technology. The proposed absorber was attached to the cylinder and measured. The measurement results are roughly the same as the simulation results. The fabricated absorber is easy to carry and flexible, such that it can easily be conformed to irregular objects. The proposed absorber is polarization-insensitive, low profile, thin, and portable, so it is easier to apply in a variety of practical fields.
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spelling pubmed-76624042020-11-14 Ultra-Wideband Flexible Absorber in Microwave Frequency Band Fan, Shicheng Song, Yaoliang Materials (Basel) Article In this paper, an ultra-wideband flexible absorber is proposed. Based on a summary of the absorption mechanism, using lossless air to replace the heavy lossy dielectric layer will not substantially impact the absorption. The dielectric layer is only a thin layer of polyimide. The proposed absorber is a sandwich structure. The surface is a layer of copper metal ring and wire, and it is loaded with chip resistors to expand the absorber bandwidth. Simulated results show that the bandwidth of the proposed absorber, with an absorptivity of more than 90%, is 2.55–10.07 GHz, with a relative bandwidth over 119.2%. When the electromagnetic wave has a wide incident angle, the absorber still maintains a high absorption. This absorber has been fabricated by FPC (flexible printed circuit) technology. The proposed absorber was attached to the cylinder and measured. The measurement results are roughly the same as the simulation results. The fabricated absorber is easy to carry and flexible, such that it can easily be conformed to irregular objects. The proposed absorber is polarization-insensitive, low profile, thin, and portable, so it is easier to apply in a variety of practical fields. MDPI 2020-10-30 /pmc/articles/PMC7662404/ /pubmed/33143266 http://dx.doi.org/10.3390/ma13214883 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Fan, Shicheng
Song, Yaoliang
Ultra-Wideband Flexible Absorber in Microwave Frequency Band
title Ultra-Wideband Flexible Absorber in Microwave Frequency Band
title_full Ultra-Wideband Flexible Absorber in Microwave Frequency Band
title_fullStr Ultra-Wideband Flexible Absorber in Microwave Frequency Band
title_full_unstemmed Ultra-Wideband Flexible Absorber in Microwave Frequency Band
title_short Ultra-Wideband Flexible Absorber in Microwave Frequency Band
title_sort ultra-wideband flexible absorber in microwave frequency band
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7662404/
https://www.ncbi.nlm.nih.gov/pubmed/33143266
http://dx.doi.org/10.3390/ma13214883
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