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Materials 2018, 11(9), 1612; https://doi.org/10.3390/ma11091612

Transmission Attenuation Power Ratio Analysis of Flexible Electromagnetic Absorber Sheets Combined with a Metal Layer

1
Department of Electronic Engineering, University of Valencia, 46100 Burjassot, Spain
2
Würth Elektronik eiSos GmbH & Co. KG, 74638 Waldenburg, Germany
*
Author to whom correspondence should be addressed.
Received: 27 July 2018 / Revised: 27 August 2018 / Accepted: 3 September 2018 / Published: 4 September 2018
(This article belongs to the Special Issue Electromagnetic Wave Absorbing Structures)
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Abstract

Electromagnetic noise absorber sheets have become a solution for solving complex electromagnetic interference (EMI) problems due to their high magnetic losses. This contribution is focused on characterizing a novel structure that is based on an absorber film with a metal layer attached on its top side. Two different absorber compositions were combined with Al and Cu metal layers in order to study the improvement on the performance of these structures, depending on the complex permeability, absorber film thickness, and type of metal. The transmission attenuation power ratio of the absorber films is analyzed and compared to the performance of absorber and metal structures. The measurement procedure is carried out attaching the films into a microstrip line that has been designed based on IEC standard (IEC 62333-2). This test fixture is employed as a transmission line to simulate a general noise path. The performance of absorber composites to filter electromagnetic noise is evaluated through analyzing S21 and S11 parameters. This is carried out with the aim of finding out in which conditions the absorption loss is improved when a metal layer is attached. In addition, the possible re-radiation effect, due to the magnetic field that is generated by the eddy currents induced in the metal layer, is examined. View Full-Text
Keywords: flexible electromagnetic absorber sheet; complex permeability; magnetic materials; electromagnetic interference; power absorption; microstrip line; insertion loss flexible electromagnetic absorber sheet; complex permeability; magnetic materials; electromagnetic interference; power absorption; microstrip line; insertion loss
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Victoria, J.; Suarez, A.; Torres, J.; Martinez, P.A.; Alcarria, A.; Martos, J.; Garcia-Olcina, R.; Soret, J.; Muetsch, S.; Gerfer, A. Transmission Attenuation Power Ratio Analysis of Flexible Electromagnetic Absorber Sheets Combined with a Metal Layer. Materials 2018, 11, 1612.

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