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Study of the electromagnetic interactions between radar equipment under integrated and compact mature : design and validation

Abstract : Metamaterials (MM) are artificially engineered sub wavelength materials that can provide exceptional electromagnetic properties. Their electromagnetic properties can be changed by changing their shapes. They have been used for the design of antennas, Radar Absorbers (RA), cloak devices and so on. In the aim of reducing electromagnetic interference in radomes of military vessels, in this thesis we have used Frequency Selective Surfaces, which are a family of MM, to design thin and broadband RA for the 1-10 GHz frequency band. The RA designed in this thesis have been studied for different polarizations (TE and TM) and for different incidence angles. The Radar Cross Section (RCS) of the developed RA have also been studied. These RA have been fabricated and an excellent agreement have been found between measured and simulated absorption results. In order to improve the cross-polarization absorption of our RA, a ‘chessboard’ configuration of the full structures have been proposed and studied. Furthermore, the theoretical to real thickness ratio of developed RA have been calculated and results suggest that their performances are high. Also, a theoretical study has enabled us to design conformal RA for cylindrical metallic bodies. These RA are in fact sectors of dielectrics conformed around the cylindrical target. It has been shown that the total scattering and shadow zones of cylindrical metallic bodies can be reduced. The fabrication, characterization and measurement of this concept will be a remarkable result of this thesis.
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  • HAL Id : tel-02503628, version 2

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Thtreswar Beeharry. Study of the electromagnetic interactions between radar equipment under integrated and compact mature : design and validation. Materials and structures in mechanics [physics.class-ph]. Université de Nanterre - Paris X, 2019. English. ⟨NNT : 2019PA100011⟩. ⟨tel-02503628v2⟩

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