Literatura científica selecionada sobre o tema "Dispositifs à ondes millimétriques – Efficacité"
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Teses / dissertações sobre o assunto "Dispositifs à ondes millimétriques – Efficacité"
Nguyen, Tran Quang Khai. "Développement de système antennaire pour les communications 5G". Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4100.
Texto completo da fonteThe work in this thesis has been funded by the French FUI project MASS-START (2017-2020). The project aims at the integration of 5G compatible baseband and radio subsystems into an Over-Air-Interface-based 5G terminal and gNodeB demonstrator, and the antenna array for end-to-end Multiple Input Multiple Output link experimentation. The scope of the thesis concerns the design and assessment of antenna systems that are to be used in the project.At 5G Frequency Range 1 band, the work concentrates on the development of a methodology to design antenna with a matching circuit for mobile terminals with limited area. The bandwidth limitation is evaluated using Quality-Factor. A Particle Swarm Optimization algorithm is proposed and examined in different antenna designs for mobile terminals. The final design demonstrates a system with three non-resonating coupling elements covering most of the sub-6GHz bands of 5G. At 5G Frequency Range 2 band, more precisely band n258 of Europe, different types of array antennas are studied. The work first checks two types of feeding for a patch antenna that can be integrated into Printed Circuit Board to have a low profile antenna and ease the fabrication procedure. The designs are later fabricated and experimentally evaluated. With a Millimeter-Wave array at hand, we proceed a measurement campaign in which the effects of the user's finger at close proximity of the antenna are evaluated. The losses due to absorption, reflection, diffraction are quantified and compared with numerical estimations in literature. A system of multiple end-fire arrays placed at different locations in a terminal is also studied showing the compromising effectiveness if one array is severely blocked
Quan, Yibo. "Performance evaluation and resource allocation in millimeter waves device-to-device networks with beamforming". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAT024.
Texto completo da fonteDevice-to-Device (D2D) communication is a key technology for future wireless networks, allowingdevices to communicate directly without relying on a cellular infrastructure. Millimeter wave (mm-Wave) communication utilizes high-frequency radio, providing very large bandwidths for fast and reliable D2D transmissions. However, mmWave frequencies have high attenuation, requiring devices to have multiple antennas and perform beamforming. The success of beamforming requires beam training. The beam misalignment can impact the performance of the network. To address these challenges, our study focuses on the theoretical analysis of the performance of mmWave D2D communications within the context of Ultra-Reliable Low Latency Communications(URLLC). We use stochastic geometry and queuing theory to evaluate both spatial and temporalvariations in performance from two different perspectives: the instantaneous average properties of the random network and the global stability properties of a dynamic network with random service requests. For the dynamic properties, we focus on the stability condition of D2D network by introducing directional antennas arrays for the D2D users. The network is modeled based on a spatial birth-death process. For the instantaneous properties, we mainly care about the meta-distribution of the network, which is a metric that accounts for the spatial distribution of coverageprobability. We derive the meta-distribution of the effective rate as a statistical latency guarantee for URLLC communications, by considering both the training overhead and misalignment for a D2D network with beamforming. At last, we propose methods to choose the optimal number of antennas and to allocate resource for beam training
Linardou, Irini. "Antenne Vivaldi : potentialités d'applications en ondes millimétriques". Nice, 2000. http://www.theses.fr/2000NICE5455.
Texto completo da fonteRay, Brigitte. "Conception, optimisation et réalisation d'un mélangeur quasi-optique en ondes millimétriques". Toulouse 3, 1992. http://www.theses.fr/1992TOU30274.
Texto completo da fonteDalle, Christophe. "Contribution à l'étude des dispositifs à jonction P-N en gamme millimétrique : application aux diodes avalanche en régime de génération directe et harmonique". Lille 1, 1986. http://www.theses.fr/1986LIL10099.
Texto completo da fonteDemuynck, Claire. "Etude en ondes millimétriques et submillimétriques d'espèces réactives : détection d'ions et de radicaux libres au laboratoire et dans le milieu interstellaire". Lille 1, 1986. http://www.theses.fr/1986LIL10062.
Texto completo da fonteFriscourt, Marie-Renée. "Étude des dispositifs à transfert électronique pour la génération de puissance en gamme millimétrique". Lille 1, 1985. http://www.theses.fr/1985LIL10015.
Texto completo da fonteWallez, Claire. "Absorption et diffusion des ondes électromagnétiques par les hydrométéores. Application à l'imagerie radiométrique en ondes millimétriques". Toulouse 3, 1994. http://www.theses.fr/1994TOU30089.
Texto completo da fonteDerycke, Alain. "Etudes théoriques et expérimentales des modules préaccordés radiaux : application à l'intégration des composants en ondes millimétriques". Lille 1, 1986. http://www.theses.fr/1986LIL10090.
Texto completo da fonteOrlic, Yovan. "Dispositifs flexibles de communication à 60 GHz reconfigurables mécaniquement". Thesis, Ecole centrale de Lille, 2014. http://www.theses.fr/2014ECLI0002/document.
Texto completo da fonteThere is an increasing need for tunable antennas in the 60 GHz band for remote sensing application and wireless communication. Traditional tuning solutions are based on semiconductor or conventional RF-MEMS but these component face cost, complexity and losses issues at millimeter waves. In this thesis, an original approach was developed: it is based on the mechanical reconfiguration of millimeter wave microstrip antennas and devices printed on ultrasoft elastomeric PDMS substrate, thanks to large displacement MEMS actuators.First, a quick history and context on the telecommunication explain the recent interest toward the 60 GHz band for telecommunication and the need for tenability and advantage of mechanical tenability at this frequencies. The ultrasoft polymeric PDMS is then studied. It is caracterised both mechanically and dielectrially. Then the different applications developed during this thesis are presented: frequency tunable antenna and beam steering systems. Different actuation solution (pneumatic, magnetic, electro-fluidic interaction) are explored
Livros sobre o assunto "Dispositifs à ondes millimétriques – Efficacité"
RF and Mm-Wave Power Generation in Silicon. Elsevier Science & Technology Books, 2015.
Encontre o texto completo da fonteWang, Hua, e Kaushik Sengupta. RF and Mm-Wave Power Generation in Silicon. Elsevier Science & Technology Books, 2015.
Encontre o texto completo da fonteKoul, Shiban Kishen, e Karthikeya G. S. Millimeter Wave Antennas for 5G Mobile Terminals and Base Stations. Taylor & Francis Group, 2020.
Encontre o texto completo da fonteKoul, Shiban Kishen, e Karthikeya G. S. Millimeter Wave Antennas for 5G Mobile Terminals and Base Stations. Taylor & Francis Group, 2020.
Encontre o texto completo da fonte