Tesis sobre el tema "Réseaux micro-ondes"
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Fonseca, Nelson Jorge Gonçalves. "Etude de Systèmes Micro-ondes d'Alimentation d'Antennes Réseaux pour Applications Multifaisceaux". Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0071/document.
Texto completoBeam forming networks for multiple beam antennas are a very important antenna sub-system as they enable to reuse the same radiating aperture to produce all the beams. These solutions naturally find application in space as stringent accommodation constraints on board of satellites ask for space saving. Several concepts are available in the literature, including quasi-optic solutions and guided wave solutions. We investigated on this second category, including namely Blass, Butler and Nolen matrices as well as beam forming networks producing uniform phase distribution. In particular, we proposed a designed method, defined as an asymptotic singular case of a more general Blass matrix design procedure. Experimental validation was carried out with a specific design in S-band. Flexibility on the design of Nolen matrix has been used to generate non-uniform amplitude distribution to reduce side-lobe level. Also, natural phase dispersion of a serial feeding network has been used to produce frequency independent beam pointing linear arrays with potential application to Blass and Nolen matrices. Beam forming networks with uniform phase distribution associated to uniform and Gaussian amplitude distributions were also investigated, in particular to highlight the level of the intrinsic losses. The structure with Gaussian amplitude distribution was also modified to be adapted to circular array antennas. All this information should help to identify the best suited beam forming network concept for a given application. In some particular cases, a combination of different concepts can even be considered
Türer, Ibrahim. "Modélisation de dispositifs terahertz appliquée à des réseaux imageurs de détecteurs bolométriques". Paris 6, 2010. http://www.theses.fr/2010PA066672.
Texto completoSilinski, Brigitte. "Polymérisation sous micro-ondes de résines époxydes et polyuréthannes : application à la synthèse de réseaux interpénétrés". Toulouse, INPT, 1990. http://www.theses.fr/1990INPT046G.
Texto completoSassine, Sami. "Transport électronique contrôlé par micro-ondes dans des microstructures asymétriques : effet ratchet mésoscopique". Toulouse, INSA, 2007. http://eprint.insa-toulouse.fr/archive/00000203/.
Texto completoIn this thesis we present the study of directed electron transport, induced by linear-polarized microwave radiations, in artificial asymmetric microstructures based on semiconductors. The samples used are high mobility two-dimensional electron gases based on AlGaAs/GaAs heterojunctions. Lattices of semicircular-shaped antidots were fabricated on these samples in order to control the transport properties. We clearly observed directed transport phenomenon which results in the appearance of a dc-voltage (2–20 mV) in the asymmetric antidot lattice under irradiation with microwaves of frequency 33–75 GHz. We demonstrated that it is possible to change the direction of the transport by changing the direction of the linear polarization. Moreover, the effect depends linearly on the microwave power; it disappears at liquid nitrogen temperature when the electron mean free path becomes comparable to the distance between antidots. Finally, it is suppressed by the application of a relatively low magnetic field (0. 2 T). The measurements in lattices of circular (symmetric) antidots demonstrated the absence of this “ratchet” effect in this case. The qualitative and quantitative comparisons to recent theoretical predictions show a good agreement between theory and experiment. This experimental investigation offers perspectives for industrial applications: the structures studied in this thesis can be used to fabricate new micro-scale current generators and new electromagnetic radiation detectors sensitive to polarization and having a linear response to the microwave power
Nepomuceno, Napoleao. "Optimisation dans des réseaux backhaul sans fil". Phd thesis, Université de Nice Sophia-Antipolis, 2010. http://tel.archives-ouvertes.fr/tel-00593412.
Texto completoAcikgoz, Hulusi. "Technique d'inversion associant la modélisation numérique et les réseaux de neurones pour la caractérisation micro-ondes de matériaux". Paris 6, 2008. http://www.theses.fr/2008PA066387.
Texto completoBonnet, Benoît. "Etude et réalisation de filtres et d'antennes intégrés pour applications radiofréquences et micro-ondes". Tours, 2006. http://www.theses.fr/2006TOUR4036.
Texto completoWireless communications have progressed very rapidly in recent years, and many systems are becoming smaller and smaller. The miniaturization requirement is important, so the amplifiers, baluns, antennas and filters must have their dimensions reduced accordingly. It is within this context that we are interested in the realization of filters and miniature antennas in the range of radio frequencies for telecommunications systemes and wireless networks. The works presented in this thesis goes in two directions. The first concerns the study and realization of filters with the available multilayer technology. It offers the possibility to integrate passive components such as inductors, capacitors, resistors and transmission lines. The study is performed on planar filters with lumped elements, distributed elements or coupled lines. The investigations concern the possibility of integrating filtering function on the multilayer technology for wireless systems and the study of the behavior of the technology around 26GHz. Several electromagnetic (EM) simulations are performed on combline filters with a coplanar structure. Some prototypes are realized in order to validate the results and calibrate the HFSS EM simulator. Finally, an analysis based on simulatons is performed to obtain reconfigurable filters with Varicap or PIN diodes. The second part covers the design, realization and characterization of miniature antennas with multilayer technology for wireless networks. Some generalities on the measurement conditions and main characteristics of antenna are introduced. The study focuses on the meander line antenna operating between 1GHz and 5GHz. An analytical model set by the antenna geometrical parameters is established with the use of design of experiment method. In addition, a study and validation of a dual band meander line antenna are performed in order to cover the WLAN standard. Finally, EM simulations on the antenna patches are performed in order to look at the possibilities offered by multilayer technology at higher frequencies
Kacimi, Sahra. "Contribution à la restitution des précipitations tropicales par radiométrie micro-ondes : préparation à la mission Megha-Tropiques". Versailles-St Quentin en Yvelines, 2012. http://www.theses.fr/2012VERS0064.
Texto completoWithin the framework of the global warming, the analysis of water and energy budget is of major importance. Considering the Megha-Tropiques (MT) mission whose one of the scientific objectives is to improve the knowledge of water and energy cycle in the intertropical region, the estimation of instantaneous surface rainfall is of the great importance. My PhD work focuses on the optimization of a multi-region, the estimation of instantaneous surface rainfall is of great importance. My PhD work focuses on the optimization of a multi-plateform Bayesian retrieval algorithm called BRAIN (Bayesian Retrieval Algorithm Including Neural Networks) (Viltard et al. , 2006) used for MT. This algorithm uses passive microwave data from satellites such as TRMM, SSM/I and AQUA. It uses a Bayesian Monte Carlo approach to retrieve several atmospheric parameters such as the instantaneous rainfall rate. In order to get a more accurate rainfall restitution, two research axes were investigated : the detection of a priori rainy areas that takes place before the rainfall estimation itself, and the impact of the database and inversion parameters. First, the database on which the algorithm relies needs to be more representative especially as far as high rain rates are concerned. To improve the representativeness of the inversion database, we need first to eliminate repetitive profiles, that is to say extract prototypes from it. To be made, we use Self Organizing Maps SO%s developed by T. Kohonen (2001). Second, the improvement of the rainy-non-rainy pixels classification before the inversion was made using neural networks
Chahat, Nacer. "Antenne, propagation et interaction avec le corps pour les applications de type réseaux corporels sans fil en micro-ondes et en millimétrique". Rennes 1, 2012. http://www.theses.fr/2012REN1S079.
Texto completoRecent progress in miniaturization of communicating devices and design of smart networks has triggered increased interest to body area networks (BAN) having a very strong potential for near future applications including military, personal healthcare, sport, space, entertainment, smart home, etc. This increasing attention to BAN and PAN (Personal Area Networks) applications has led to the development of textile sensors that can be easily integrated into clothes and to the buildup of high-data-rate wireless devices. The PhD thesis project has two main objectives. First, several microwave textile antennas have been optimized and fabricated to evaluate the interaction with the human body. The impact of the human body on the antenna performance is of great importance since it can directly impact the efficiency of on-body devices and global performances of the system. The power absorption in the body was also studied using realistic body models with different morphologies. Second, the unlicensed 57-64 GHz band have been studied in the wireless BAN context since it provides several advantages compared to microwave BAN. In particular, very high data rates can be reached (up to 5 Gb/s) whilst providing high level of security and low interference with adjacent networks. Besides, the on-body devices are much smaller at millimeter waves compared to those operating at microwaves
Pinon, Stéphane. "Etude de la reconfigurabilite de circuits RF par des réseaux fluidiques. Conception et fabrication de microsystèmes, intégrés sur substrat souple". Phd thesis, Université Paul Sabatier - Toulouse III, 2012. http://tel.archives-ouvertes.fr/tel-00781783.
Texto completoBellomo, Lucio. "Étude et réalisation d'un radar ULB à conjugaison de phase en micro-ondes". Electronic Thesis or Diss., Toulon, 2012. http://www.theses.fr/2012TOUL0002.
Texto completoThis thesis deals with non-destructive electromagnetic imaging. Its originality lies, primarily, in a marked experimental approach, which has led to the realization of a RADAR prototype able to acquire multisource-multistatic data within the [2-4] GHz frequency band. Furthermore, the system implements beamforming through a numerically-controlled attenuator/phase shifter array.On the one hand, qualitative imaging experiments have been performed. Time Reversal, as well as DORT and TR-MUSIC methods, have been applied to detect and localize scattering objects. In particular, the case of reverberating media has been dealt with.On the other hand, the prototype has been used for quantitative inverse scattering with very aspect-limited data. A non-linearized iterative algorithm taking into account the multi-frequency nature of the data has been adapted to the experimental configuration through a performing calibration procedure.Finally, the possibility of exploiting the features of Time Reversal within the quantitative frame has been studied. The goal is the improvement of the results in random media mimicking those typical of medical imaging (tumor detection) or sub-surface probing (land mine or oil detection) applications
Bellomo, Lucio. "Étude et réalisation d'un radar ULB à conjugaison de phase en micro-ondes". Phd thesis, Toulon, 2012. http://tel.archives-ouvertes.fr/tel-00703376.
Texto completoChehade, Habib. "Modélisation des composants microélectroniques non linéaires par séries de Volterra à noyaux dynamiques, pour la CAO des circuits RF et micro-ondes". Limoges, 1998. http://www.theses.fr/1998LIMO0041.
Texto completoBenzaim, Oussama. "Techniques multi-port pour la conception et la réalisation de systèmes micro-ondes dédiés à l'évaluation non destructive de matériaux". Electronic Thesis or Diss., Lille 1, 2009. http://www.theses.fr/2009LIL10031.
Texto completoNon Destructive microwave Testing (NDT) consists in examining a material so that after testing, its future use is not affected. Such characterization is usually achieved through the measurement of reflection and/or transmission properties of the material under test by a vector network analyzer. However, this type of equipment is oversized in terms of measurements abilities and cost for a use outside the laboratory. In order to overcome this limitation, we have developed, with a view to low cost, systems based on the six-port technique. In particular, a dual four-port reflectometer is developed for the measurement of reflection and transmission parameters of passive devices in the frequency range of 55 - 65 GHz. In addition, we have proposed complete solution which integrates hardware and software resources allowing the development of specialized systems in the field of microwave characterization. The added software solutions, based on artificial neural networks contribute to satisfy the needs of a non-destructive, quantitative evaluation. Finally, in order to perform characterization of defects whose dimensions are smaller than the wavelength, a mm-wave microscope formed by the mm-wave system and associated with an evanescent wave probe has been proposed. This ensemble reveals changes in magnitude and phase reflection coefficients of the material under test, allowing non-contact measurements. ___________________________________________________________________________
Pinon, Stéphane. "Étude de la reconfigurabilité de circuits RF par des réseaux fluidiques : conception et fabrication de microsystèmes intégrés sur substrat souple". Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1871/.
Texto completoMicrofluidics is a relatively new field, it really appeared in the early 90s. But this area has experienced strong growth and has reached maturity that allows it to intervene in a wide range of applications, chemical, biological, genomic, optical. . . This growth was made possible by the development of specific technology and particularly technologies by polymers. The thesis presented here is therefore based on the technological expertise of the laboratory in microfabrication to achieve a coupling between microfluidics and microwave and thus expand even further its range of application. One of the current challenges for emission-reception circuitry is reconfigurable miniaturization of passive components. Tunable filters by means microfluidics have been studied to characterize the design, through manufacturing an important work. This is based on the technique of laminating dry film SU-8 and helped integrate microfluidic channels for substrates microstrip filters. Circulation of distilled water showed very good results in terms of shifts in the center frequency. Other lines of liquid-interactions microwaves are also presented using filters such as a sensor element as chemical or biological
Benzaim, Oussama. "Techniques multi-port pour la conception et la réalisation de systèmes micro-ondes dédiés à l'évaluation non destructive de matériaux". Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10031/document.
Texto completoNon Destructive microwave Testing (NDT) consists in examining a material so that after testing, its future use is not affected. Such characterization is usually achieved through the measurement of reflection and/or transmission properties of the material under test by a vector network analyzer. However, this type of equipment is oversized in terms of measurements abilities and cost for a use outside the laboratory. In order to overcome this limitation, we have developed, with a view to low cost, systems based on the six-port technique. In particular, a dual four-port reflectometer is developed for the measurement of reflection and transmission parameters of passive devices in the frequency range of 55 - 65 GHz. In addition, we have proposed complete solution which integrates hardware and software resources allowing the development of specialized systems in the field of microwave characterization. The added software solutions, based on artificial neural networks contribute to satisfy the needs of a non-destructive, quantitative evaluation. Finally, in order to perform characterization of defects whose dimensions are smaller than the wavelength, a mm-wave microscope formed by the mm-wave system and associated with an evanescent wave probe has been proposed. This ensemble reveals changes in magnitude and phase reflection coefficients of the material under test, allowing non-contact measurements. ___________________________________________________________________________
El, Yaagoubi Mohammed. "Contribution à la caractérisation temporelle de dispositifs micro-ondes non-linéaires : application à des signaux de type multiporteuse large bande". Limoges, 2006. https://aurore.unilim.fr/theses/nxfile/default/c7fe741c-de94-477f-8a8c-84b7e1915f60/blobholder:0/2006LIMO0068.pdf.
Texto completoThis work deals with the time domain characterization of non-linear devices when they are driven by broadband multitone signals. The goal is to develop an original configuration of a LSNA based measurement system (Large Signal Network Analyzer) allowing the flexibility in use and evolution capabilities for measurement of broadband modulated signals. It is described how to calibrate this bench and to exploit it to characterize new power transistor technologies as well as microwave power equipments. Two main solutions were studied to try to solve the problem of phase calibration of the system for wideband measurements. A first solution consists in narrow bandwidth interleaving. It is not very straightforward and remains complicated. A second and more efficient solution consists in using a harmonic phase reference with a fine frequency grid. Finally, this work has brought a solution for calibrated measurements of relative phases between tones of an 80MHz frequency multiplex used in satellite communication systems. We shall also mention that the hard but the key point of this work, is the self-calibration of the time equivalent sampling scope having served for the characterization of the phase reference generator
Böhm, Julian. "Phénomènes de transport originaux dans des expériences micro-ondes via la mise en forme spatiale et spectrale". Thesis, Université Côte d'Azur (ComUE), 2016. http://www.theses.fr/2016AZUR4048/document.
Texto completoTransport of waves plays an important role in modern communication systems like Wi-Fi or optical fibres. Typical problems in such systems concern security against possible intruders, energy consumption, time efficiency and the possibility of mode filtering. Microwave experiments are suited to study this kind of problems, because they offer a good control of the experimental parameters. Thus we can implement the method of wave shaping to investigate atypical transport phenomena, which address the mentioned problems. Wave front shaping solely based on the transmission together with the Wigner-Smith time delay formalism allows me to establish special scattering states in situ. These scattering states avoid a pre-selected region, focus on a specific spot or follow trajectories of classical particles, so called particle-like scattering states. Mode filtering is induced inside a waveguide with wavy boundaries and position dependent loss. The boundary profiles are chosen in such a way that the two propagating modes describe an encircling of an exceptional point in the Bloch picture. The asymmetric mode filtering is found due to the appearing non-adiabatic transitions. Another part of my work deals with Grover’s quantum search. I put such a search into practice in a two-dimensional graphene-lattice using coupled resonators, which form a tight-binding analogue. In this proof of principle experiment we search for different resonators attached to the graphene-lattice. Furthermore, the scaling behaviour of the quantum search is quantified for a linear chain of resonators
Crevoisier, Cyril. "Etude de la distribution du CO2 atmosphérique à partir des observations infrarouges à haute résolution spectrale de l'instrument AQUA/AIRS". Paris 7, 2004. http://www.theses.fr/2004PA077041.
Texto completoLu, Junjie. "Pôles et zéros de la matrice de diffusion et absorption parfaite cohérente dans les environnements réverbérants réglables". Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5048.
Texto completoIn the thesis, I present experimental results on microwave networks and reverberation chambers. The general description is based on scattering theory, describing the reflection and transmission via poles and zeros of the scattering matrix. The poles and zeros can be determined by the effective Hamiltonian approach, where coupling and loss can be taken into account appropriately. The thesis is divided into two main research subjects: the first one deals with microwave networks, simulating quantum graphs, addressing non-Weyl behavior occurring due to the openness of the system. The second one is dedicated to coherent perfect absorption (CPA) in reverberation chambers with large losses.Microwave networks are described by bonds which are connected by vertices. For the first time a variation of the coupling strength to the network is experimentally implemented. This is realized by using a dangling bond with variable length attached to the coupling vertex. Thus we indirectly vary the boundary condition at the coupling vertex from Dirichlet to Neumann. Following the poles in the complex plane, one can observe the escape of poles via a superradiant transition. These missing poles lead to a reduction of the number of poles, thus making an adjustment of Weyl's law necessary, which is termed non-Weyl behavior in graphs. This was first observed in open tetrahedral graphs, which show a complex parametric dynamics of the poles. This rich dynamics consists of loops, regions of connected poles and poles approaching infinite imaginary part. The main features can be already found in lasso graphs, which can be solved analytically.The second subject concerns reverberation chambers, where electromagnetic waves are scattered in a tunable environment. Compared to standard reverberation chambers, this one is equipped with reconfigurable intelligent surfaces (RIS). The latter allow us to tune the zeros of scattering matrix to the real frequency axis, which corresponds to a recent concept named CPA in wave physics, where no wave is escaping from a lossy system for a specific incident wave. Our experimental findings impose that the existence of CPAs can only be explained by corresponding superradiant states. This correspondence is numerically confirmed through a random matrix approach based on the effective Hamiltonian in the over-coupling regime, generally neglected in theoretical studies. Additionally, we find that the zeros of the scattering matrix close to the real axis are more sensitive in the overcoupled case than in the undercoupled one. Finally, we demonstrate that the CPA can be used for temperature sensing
Gorisse, Jean. "Regulation of power amplifiers under VSWR conditions in CMOS 65nm for 60GHz WLAN applications". Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2010. http://tel.archives-ouvertes.fr/tel-00563235.
Texto completoDominique, Cyril. "Modélisation dynamique des modules actifs à balayage électronique par séries de Volterra et intégration de ces modèles pour une simulation de type système". Paris 6, 2002. http://www.theses.fr/2002PA066106.
Texto completoLehujeur, Maximilien. "Étude d'un réservoir géothermique profond par corrélation de bruit sismique ambiant". Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAH013/document.
Texto completoThis work focuses on the application of the ambient seismic noise correlation technique for the imaging and monitoring of deep geothermal reservoirs near Rittershoffen (ECOGI) and Soultz-sous-Forêts (GEIE-EMC). The strong spatial and temporal variability of the noise sources in the period range 0.2-7s limits the reconstruction of the Green’s functions. This results in significant errors in the velocity models. Two approaches are proposed to overcome the spatial non-uniformity of the noise and to improve the quality of the velocity models. Besides that, the temporal variability of the noise sources is a limiting factor for monitoring purposes. We estimate that the speed variations should be larger than 0.1% to 1% to be detected by the available networks. This threshold was not reached at Rittershoffen during the drillings or the stimulations. However, a probable change of the diffracting properties of the medium was observed following a hydraulic stimulation
Bilzer, Claus. "Susceptibilité micro-ondes de couches minces ferromagnétiques : métrologie et analyse de la dynamique de l'aimantation". Phd thesis, Université Paris Sud - Paris XI, 2007. http://tel.archives-ouvertes.fr/tel-00202827.
Texto completoYahia, Mohamed. "Modélisation électromagnétique des structures complexes par couplage des méthodes". Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0105/document.
Texto completoHybridization of numerical methods is one inventive way in the research of the rapidity, the efficiency and the precision of the electromagnetic modeling of complex structures joining straight and large elements with complex and small ones. Instead of a global and unique formulation, we hybridize many numerical methods which are the modal methods, the finite element methods and the artificial neural networks. A novel computer- ided design (CAD) tool of complex passive microwave devices in rectangular waveguide technology is suggested. The multimodal variational method is applied to the full-wave description in the rectangular waveguides while the finite element analysis characterizes waves in the arbitrarily shaped discontinuities. The suggested hybrid approach is successfully applied to the full-wave analysis of complex discontinuities with great practical interest, thus improving CPU time and memory storage against several full-wave finite element method (FEM) based CAD tools. The proposed hybrid CAD tool is successfully extended to the design of filters with cascaded complex discontinuities. The hybridization of modal methods and the artificial neural networks improved the CPU time in the analysis of simple waveguide discontinuities which enhanced the optimization of rectangular ridged waveguide filters
Mohd, Yusoff Mohd Fairus. "Low-profile antennas at millimeter waves : study of micromachined Fabry-Perot cavity antennas and folded reflectarray antennas". Rennes 1, 2012. http://www.theses.fr/2012REN1S003.
Texto completoLes antennes à faible profil trouvent de multiples applications en raison de leur faible encombrement selon la hauteur, par exemple pour les applications embarquées. Elles possèdent aussi souvent des avantages complémentaires, tels que leur faible poids, leur coût modéré et leur facilité d’intégration. Dans ce travail de thèse, nous avons étudié et comparé deux types d’antennes à faible profil en ondes millimétriques : les antennes à résonateur de Perot-Fabry (PF), et les réseaux réflecteurs repliés. Dans le premier cas (antennes de PF), nous avons étudié de nouvelles configurations d’antennes micro-usinées en bande W, à l’aide de techniques de micro-usinage en surface et en volume. Les configurations étudiées ont été fabriquées et les résultats numériques ont été validés expérimentalement. Dans le second cas, divers réseaux réflecteurs repliés fonctionnant en polarisation linéaire ou en polarisation circulaires ont été étudiés à l’aide d’un outil de conception que nous avons spécifiquement développé pour ces travaux. Les performances de ces antennes ont été analysées, et deux prototypes ont été fabriqués en bande V pour valider les travaux théoriques
Muhammad, Nuraddeen Ado. "Analysis and design of an innovative 19.5 GHz active phase-shifter architecture, implemented in a 0.13 μm BiCMOS SiGe process, for beamforming in 5G applications". Electronic Thesis or Diss., Poitiers, 2024. http://www.theses.fr/2024POIT2257.
Texto completoFor good reasons, 5G dominates technological news. The high-bandwidth and real-time capabilities of 5G have huge societal potential by enabling a plethora of new and unanticipated application cases. Indeed, the millimeter-wave frequency band is characterized by an available bandwidth that can support high-speed wireless systems for future radio communications systems, including 5th Generation cellular systems and beyond. The frequencies of operation at mm-wave generally requires larger antenna aperture to improve the channel budget at useful distances. These antennas are usually in the form of phased arrays, allowing beamforming to be performed. This work presents the design and implementation of a 19.5 GHz active phase shifter for beamforming in 5G applications. The proposed circuit is based on an original architecture using an injection-locked voltage-controlled oscillator (ILVCO) associated with a polyphase filter followed by a phase selection circuit and its sign. The desired phase in the range of ± 45° is synthesised with the proposed circuit by altering the control voltage Vcntr of an ILVCO for fine-tuning and modifying the two control signals of phase and sign selectors (S0, S2) for coarse tuning, resulting in a 360° linear phase variation. According to the post-layout simulation results, the frequency tuning range of the VCO varies from 17.89 GHz to 20.16 GHz in free-running mode. In addition, with an injected power of -8.5 dBm and a frequency of 19.5 GHz, the proposed phase shifter draws 20.47 mA from a 1.3 V supply voltage. Furthermore, the mean output power on 50 Ω load is found to be -15.58 dBm. The whole circuit has a chip size of 1.58 mm2 including the pads and it is integrated in a BiCMOS SiGe:C 0.13 μm process. Finally, the obtained results justify that the proposed active phase shifter is a relevant design for phased-array systems used for beamforming in 5G applications
Boukabache, Hamza. "Etude et développement d'un noeud piézoélectrique intégré dans un micro-système reconfigurable : applications à la surveillance "de santé" de structures aéronautiques". Phd thesis, INSA de Toulouse, 2013. http://tel.archives-ouvertes.fr/tel-00932251.
Texto completoHaddadi, Kamel. "Systèmes à base de six-port en gammes micro-onde et millimétrique et techniques de calibrage associées : application à l'analyse de réseaux, aux télécommunications et contrôle non destructif". Lille 1, 2007. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2007/50376-2007-Haddadi.pdf.
Texto completoDastmalchi, Mansour. "Photonic processing of microwave signals". Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/29555/29555.pdf.
Texto completoCordisco, Emmanuel. "Etude de la synergie des observations satellites pour la caractérisation du manteau neigeux". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2005. http://tel.archives-ouvertes.fr/tel-00089376.
Texto completoCes travaux visent ainsi à étudier le contenu en information sur le manteau neigeux à l'échelle globale des observations satellites réalisées à partir de différents instruments couvrant différents domaines du spectre électromagnétique (visible, infrarouge et micro-ondes). Des paramètres autres que la neige interférant dans la problématique, il est nécessaire de les déterminer afin d'encadrer leurs influences. Ensuite, on cherchera comment limiter la pollution qu'engendre ces paramètres sur l'information accessible du manteau neigeux, on aura alors recours à ce que l'on appelera des statistiques locales.
Hélas ces statistiques locales ne sont pas disponibles sur l'ensemble du globe. Il est donc inévitable d'utiliser la modélisation pour permettre l'interpolation. Toutefois, une méthode originale d'ajustement de modèle par analyse en composantes principales sera présentée. Au final, la synergie entre les observations satellites, la modélisation et les mesures in situ devra être utilisée pour extraire de façon optimale l'information contenu dans les données et permettre l'inversion de l'épaisseur de neige à grande échelle.
D'autre part, il sera intéressant de caractériser les différents types de neiges existants selon une classification non-supervisée des observations satellites afin d'extraire les similitudes et les spécificités de chacun de ces types.