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Auswahl der wissenschaftlichen Literatur zum Thema „Composants microonde“
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Dissertationen zum Thema "Composants microonde"
Mothe, Nicolas. „Composants optiques à fibres multiples : applications à la sommation opto-microonde et aux fibres microstructurées mono et multicoeurs“. Limoges, 2009. https://aurore.unilim.fr/theses/nxfile/default/f0e822b2-4a8a-43d2-91ee-aa8e60c84380/blobholder:0/2009LIMO4042.pdf.
Der volle Inhalt der QuelleThese research works presented in this manuscript aim at designing, realizing and characterizing the optical summation function of hyperfrequency signals. This operation constitutes a key element of the future phased array antennas and of the opto-hyperfrequency signal processing. The principle, commonly admitted, to realize the optical summation relies on the spatial separation of the different signals on the photodiode. This limitation aims to suppress the homo/heterodyne noises detrimental for the correct addition of the microwave signals. However, we numerically and experimentally demonstrate that this principle is not funded. The solution proposed here consists in encapsulating standard optical fibers in a silica tube and in tapering the whole to desired dimensions. A summator with 14 channels is fabricated this way. No fluctuation of the summed hyperfrequency power is observed even if the signals overlap significantly over the photodiode
Djebbi, Roua. „Contribution à la réalisation par technologies additives hybrides de composants microondes 3D multi-matériaux“. Electronic Thesis or Diss., Limoges, 2024. http://www.theses.fr/2024LIMO0110.
Der volle Inhalt der QuelleThis thesis focuses on improving the performance of 3D multi-material microwave components produced through hybrid additive manufacturing technologies, utilizing sintering techniques to optimize the electrical conductivity of printed metallic tracks, and the study of various high-frequency (HF) characterization methods to assess these conductors. The bibliographic study led to the selection of direct printing technologies such as aerosol jet printing (AJP) and material micro-extrusion (nScrypt) for metallic layers, as well as 3D printing of PEKK polymer. One of the main contributions of this work lies in the integration of in situ sintering techniques, such as laser sintering, directly integrated into the nScrypt machine, allowing for the sintering of metallic deposits immediately after printing to maximize their conductive properties. Ohmic sintering was also explored as a complementary method, particularly for metal lines printed via micro-extrusion, with promising results for significantly improving conductivity. In parallel, innovative methods for HF conductivity characterization were developed. These approaches rely on specific probes enabling both contactless and direct contact characterizations, allowing for the measurement of HF conductivity over small areas and the mapping of the conductivity of printed metallic surfaces while accounting for surface roughness. This work is part of a broader goal to integrate these innovations into a hybrid additive manufacturing system, thereby optimizing the performance of 3D microwave components (transmission lines, resonators, etc.)
Madjour, Kamel. „Réalisation et caractérisation de détecteurs submillimétriques et térahertz par des composants à effets de champs à base de nitrure de Gallium“. Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10178.
Der volle Inhalt der QuelleThis thesis relates to the fabrication and the characterization of different types of Gallium nitirde based high electron mobility transistors (GaN/AlGaN heterojunction based HEMT) as millimeter and terahertz radiations detectors. The first part of this work presents a state of the art of different types of THz radiation detectors either by electronics, optics or optoelectronics approaches. This part allows a comparison of their performances. The second part deals with design and process technologies to the fabrication of GaN/AlGaN based devices. This part explains particular difficulties encounterd and solutions omplemented in the process fabrication of gratting-gate transistors. The third part describe the experimental results in free-space, up to 550GHz, of these different types of detectors (i.e. NEP, SNR, integrated horn antenna...). This part outlines the THz real-time imaging performed for the first time with GaN/AlGaN based detectors. The last part deals with the study of the intrinsic performance of these detectors. This study is based on the resistive-mixing theory in HEMTs. Modeling of the nonlinear behavior of transistors is achieved. This part relies on resistive-mixing measurements made using a new type of an on-wafer measurement bench developed in our laboratory. In conclusion, a report on the performances of all detectors studies in this thesis is done. This conclusion attempts to answer in the reasonable questions
Pacchini, Sebastien. „Etude des potentialités des nanotubes de carbone dans le domaine hyperfréquence : Application à l'élaboration de matériaux nanocomposites et contribution à la miniaturisation de composants électromécaniques (NEMS)“. Phd thesis, Université Paul Sabatier - Toulouse III, 2008. http://tel.archives-ouvertes.fr/tel-00366700.
Der volle Inhalt der QuelleGonzàlez, José Manuel. „Composants innovants recongurables par voie optique pour des applications microondes“. Limoges, 2011. https://aurore.unilim.fr/theses/nxfile/default/f3a2c16b-fd3c-47e6-9923-5f9ad25a39cf/blobholder:0/2011LIMO4048.pdf.
Der volle Inhalt der QuelleThis work focuses on novel optically reconfigurable components for microwave applications, the main objective being to propose alternative solutions to commonly used tuning methods such as MEMS or diodes. In this work, we have investigated photosensitive material characterization at microwave frequencies, and both direct and indirect methods of optical reconfigurability. To provide context for this thesis, the first part is dedicated to a bibliographic review of reconfigurable circuits and methods, thus giving an overview of the technologies used at present and showing the interest for using optical control. The second part of this dissertation is about test structures for characterizing photosensitive materials, including a presentation of materials such as Vanadium dioxide or Cadmium sulfide, among others. In the third chapter of this thesis, frequency tunable structures exploiting direct optical control are studied. The structures presented include a “proof of concept” tunable LTCC filter, a 3D dielectric resonator based on photoconductive materials, and a tunable filter based on the change of a material’s relative permittivity. The last part of this work focuses on indirect optical control showing an opto‐RF switch based on a standard Si CMOS fabrication technology
Tassetti, Charles-Marie. „Conception et réalisation de micro-inductances variables, micro-usinées, pour applications radiofréquences et microondes“. Paris 11, 2005. http://www.theses.fr/2005PA112079.
Der volle Inhalt der QuelleDue to the increasing need of very small passive component chips, which represent a large surface on the cell phone electronic board, many laboratories try to integrate these passive components, with constant electric characteristics, into RF application chips. The research on tunable micro-components is still insignificant, despite the important market the future communication systems can represent. The study presented in this Ph. D. Report gives a concrete response to the conception and realization of tunable MEMS inductors. The first chapters focus on the feasibility of such components, and describe their design and fabrication process flow. The solution used to realize tunable MEMS inductors is based on magnetic coupling variations, between electric circuits, produced by mechanical displacements. Such a method gives large and continuous inductor variation ratios. The electric model proposed for this tunable micro-inductor has been validated by measurements. The last chapter gives some examples of tunable RF functions realized using tunable MEMS inductors and tunable MEMS capacitors. Measurements performed on these demonstrators validate the feasibility of tunable RF functions with continuous variation ratios
Husse, Emmanuelle. „Conception, réalisation et caractérisation de composants passifs microondes supraconducteurs à haute température critique“. Lille 1, 1996. http://www.theses.fr/1996LIL10184.
Der volle Inhalt der QuelleRammal, Rim. „Conception de Composants Microondes Innovants basés sur de Nouveaux Procédés Technologiques de Fabrication“. Limoges, 2014. https://aurore.unilim.fr/theses/nxfile/default/c41c2fd1-8953-4bff-b464-be12c3d6ef4a/blobholder:0/2014LIMO4014.pdf.
Der volle Inhalt der QuelleThis thesis is devoted to the characterization of an innovative inkjet printing technology for the fabrication of multilayer and multi-material structures. We will use this technology to create printed single and multilayer interdigitated filters. The multilayer aspects open the way to work on tunable structures that could be the same type as the interdigitated multilayer filter. The first chapter consists of a literature study on multilayer technologies and in particular the inkjet printing technology. In the second chapter, we tested this technology by printing 2-D patterns with –made with a silver ink in order to establish different design rules to be applied for the creation of RF components. A multilayer printing approach (silver and ceramic inks) is validated after a development of the ceramic-based ink developed with the Heraeus 51K65 dielectric material which can be fired at low temperature (800°C). The third section presents a multilayer filter fabricated by this technology in order to achieve footprint reduction compared to a silver monolayer interdigitated filter. The fourth chapter presents a simple planar system to easily retrieve an equivalent model of a varactor (Rs and Cj) to serve as a component of frequency tuning. Different examples of tunable resonators using such varactor are finally presented
Paillot, Thomas. „Etude de composants MEMS RF pour les circuits hyperfréquences et millimètriques“. Limoges, 2005. https://aurore.unilim.fr/theses/nxfile/default/4476a58f-9a3c-467d-93cf-45881d3a1e6a/blobholder:0/2005LIMO0040.pdf.
Der volle Inhalt der QuelleThis work presents MEMS component applications for radio frequency and millimeter wave circuits. These components have been used for the realization of switch functions and also integrated to "classic" RF circuits, resonators and filters, in order to obtain frequency tunable circuits. Several circuits have been presented, low loss capacitive switches in Ka band, capacitive switches for high power applications and finally tunable resonators and filters. A particular study has been made so as to demonstrate microstrip tunable circuits. The measurements obtained on a two pole tunable filter using four MEMS variable capacitors show the potential of micro electromechanical components to realize high quality factor circuits
WONG, MAN-FAI. „Methode des elements finis mixtes 3d appliquee a la caracterisation des composants passifs microondes et millimetriques“. Paris 7, 1993. http://www.theses.fr/1993PA077219.
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