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Academic literature on the topic 'Réseaux micro-ondes'
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Journal articles on the topic "Réseaux micro-ondes"
Yapi, N'guessan Apolline, Marielle Gosset, Modeste Kacou, Éric-Pascal Zahiri, Matias Alcoba, Hamadou Boubacar, Patrick Happy, and Paul Assamoi. "Estimation des précipitations via les réseaux de téléphonie mobile : exemple en Afrique subsaharienne." La Météorologie, no. 121 (2023): 055. http://dx.doi.org/10.37053/lameteorologie-2023-0043.
Full textACHKAR, Joseph. "Analyseurs de réseaux en micro-ondes." Mesures et tests électroniques, December 2006. http://dx.doi.org/10.51257/a-v2-r1145.
Full textACHKAR, Joseph. "Analyseurs de réseaux en micro-ondes." Mesures et tests électroniques, December 2006. http://dx.doi.org/10.51257/a-v1-r1145.
Full textDissertations / Theses on the topic "Réseaux micro-ondes"
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.
Full textBeam 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.
Full textSilinski, 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.
Full textSassine, Sami. "Transport électronique contrôlé par micro-ondes dans des microstructures asymétriques : effet ratchet mésoscopique." Toulouse, INSA, 2007. http://eprint.insa-toulouse.fr/archive/00000203/.
Full textIn 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.
Full textAcikgoz, 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.
Full textBonnet, Benoît. "Etude et réalisation de filtres et d'antennes intégrés pour applications radiofréquences et micro-ondes." Tours, 2006. http://www.theses.fr/2006TOUR4036.
Full textWireless 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.
Full textWithin 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.
Full textRecent 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.
Full textBooks on the topic "Réseaux micro-ondes"
Tekin, Ahmet, and Ahmed Emira. High Frequency Communication and Sensing. Taylor & Francis Group, 2014.
Find full textTekin, Ahmet, and Ahmed Emira. High Frequency Communication and Sensing: Traveling-Wave Techniques. Taylor & Francis Group, 2018.
Find full textTekin, Ahmet, and Ahmed Emira. High Frequency Communication and Sensing: Traveling-Wave Techniques. Taylor & Francis Group, 2018.
Find full textTekin, Ahmet, and Ahmed Emira. High Frequency Communication and Sensing: Traveling-Wave Techniques. Taylor & Francis Group, 2018.
Find full textTekin, Ahmet, and Ahmed Emira. High Frequency Communication and Sensing: Traveling-Wave Techniques. Taylor & Francis Group, 2018.
Find full textHigh Frequency Communication and Sensing: Traveling-Wave Techniques. Taylor & Francis Group, 2014.
Find full textNegative Group Delay Devices: From Concepts to Applications. Institution of Engineering & Technology, 2018.
Find full textNegative Group Delay Devices: From Concepts to Applications. Institution of Engineering & Technology, 2019.
Find full textAlmalkawi, Mohammad. RF and Microwave Module Level Design and Integration. Institution of Engineering & Technology, 2019.
Find full textRF and Microwave Module Level Design and Integration. Institution of Engineering & Technology, 2019.
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