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Journal Articles Materials Year : 2018

Ultra-Wideband and Wide-Angle Microwave Metamaterial Absorber

Absorbant micro-ondes à metamatériaux ultra large bande et large incidence.

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Abstract

In order to extend the performance of radar absorbing materials, it is necessary to design new structures with wideband properties and large angles of incidence which are also as thin as possible. The objective of this work, realized within the framework of the SAFAS project (self-complementary surface with low signature) is, then, the development of an ultra-wideband microwave absorber of low thickness. The design of such material requires a multilayered structure composed with dielectric layers, metasurfaces, and wide-angle impedance matching layers. This solution has been realized with on-the-shelf materials, and measured to validate the concept. At normal incidence, the bandwidth ratio, defined for a magnitude of the reflection coefficient below -10 dB, is 4.7:1 for an absorber with a total thickness of 11.5 mm, which corresponds to ʎ/7 at the lowest operating frequency. For an incidence of 60°, this bandwidth ratio is reduced to 3.8:1, but the device remains ultra-wideband.
Afin d'améliorer les performances de matériaux absorbants radar, il est nécessaire de faire la conception de nouvelles structures possédant une très large bande passante en fréquence pour un secteur angulaire également important. L'objectif de ces travaux dans le contexte du projet SAFAS (surfaces auto complémentaires à faible signature ) est donc le développement d'absorbants ultra large bande à faible épaisseur.
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Dates and versions

hal-01985673 , version 1 (18-01-2019)

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Cite

Xavier Begaud, Anne Claire Lepage, Stefan Varault, Michel Soiron, André Barka. Ultra-Wideband and Wide-Angle Microwave Metamaterial Absorber. Materials, 2018, Special Issue Electromagnetic Wave Absorbing Structures, 11 (2045), pp.1-9. ⟨10.3390/ma11102045⟩. ⟨hal-01985673⟩
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