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• W2714092641 abstract "In this thesis we studied some passive components based on metamaterials. Our goal was to assess the physical properties of CRLH lines combined with a ferrite substrate. When the CRLH TLs are integrated with ferrite substrate, new properties based on the “CRLH” structure and nonreciprocity of ferrite can be obtained. Samples were processed on dielectric substrate (alumina) as well as on YIG substrate, according to fabrication steps which are described in this work. These samples have been characterized, in particular for the YIG substrate, with and without a magnetic polarization field. 3D Finite element simulation was used to get the scattering parameters. Lastly, dispersion diagrams were extracted from both measured and simulated data.We can get nonreciprocity by modeling the ferrite substrate, and “left-handed” property by modeling the structure of CRLH. The first chapter of this manuscript focus on theories of microwave transmission lines, coplanar waveguides, magnetic materials and metamaterials. In the second chapter, we designed and implemented conventional CPW components as well as stand-alone capacitors and inductors on alumina substrate. We completed the fabrication process in NANOLYON. Then the simulations in software COMSOL, and the analytical modelling approaches in Matlab are presented. The measured, simulated and analytical S parameters are given, the corresponding propagation constants of CPW, the extracted values of capacitance and inductance are given and discussed. The CPW components on ferrite are introduced in the third chapter. Firstly, different kinds of ferrite and the fabrication of components are presented. Then the modelling of permeability of ferrite material is detailed, and implemented in the 3D finite element simulation. The nonreciprocity is studied using CPW components based on ferrite BaM and YIG. For CPW on ferrite substrate, the measured and simulated S parameters, as well as propagation constant are given. In chapter four, the modelling of CRLH transmission line and the CRLH transmission line theory were presented. Examples of balanced and unbalanced CRLH TL are presented and the dispersion diagram is given. Then a parametric study of the components realized on alumina and on YIG has been driven. The geometric parameters were the left-handed inductances, left-handed capacitances and the length of the CPW separating them (CPW2). Both experimental and simulated scattering parameters are shown and the corresponding propagation constants are given. That enables to identify the different frequency bands: left-handed band, right-handed band and bandgap. Moreover, we establish that the band structure of these components can be tuned with the magnetic applied field." @default.
• W2714092641 created "2017-06-30" @default.
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• W2714092641 date "2012-03-06" @default.
• W2714092641 modified "2023-09-24" @default.
• W2714092641 title "Study of passive microwave and millimetre wave components based on matematerials and ferrite" @default.
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