Academic literature on the topic 'Antenne à dépointage électronique'
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Journal articles on the topic "Antenne à dépointage électronique":
Avrillon, S. "Initiation à la conception d’antennes Yagi-Uda pour des lycéens." J3eA 18 (2019): 1001. http://dx.doi.org/10.1051/j3ea/20191001.
Dissertations / Theses on the topic "Antenne à dépointage électronique":
Clemente, Antonio. "Conception d'antennes à réseaux transmetteurs à dépointage et formation de faisceau." Rennes 1, 2012. http://www.theses.fr/2012REN1S094.
This PhD thesis investigates the design and realisation of electronically reconfigurable transmit-array antennas. A transmit-array is composed of one or more focal sources illuminating a first antenna array operating in receive mode and connected, using phase-shift elements, to a second antenna array operating in transmission mode. The incident power received on the first array, as in the case of a lens, is transmitted in the free space and can be focused or collimated by tuning the transmission phase of the unit-cells in order to obtain a specific phase distribution across the array aperture. Beam-steering and beam-forming can be achieved using electronically tunable unit-cells. A theoretical study of transmit-arrays performances has been carried out using an in-house CAD tool based on analytical formulas. The reduction of the focal distance using multiple feeds and the reduction of the spill-over losses using a beam-formed focal source have been investigated as well. A linearly-polarized electronically reconfigurable transmit-array at X-band frequencies has been designed and demonstrated. This prototype is composed of 20×20 unit-cells. 800 PIN diodes have been integrated on the array in order to control the transmission phase of each unit-cell. A maximum broadside gain of 22,7 dBi, a bandwidth of 1,56 GHz (15,6% at 10 GHz), a total efficiency of 52,9% , and a 2D beam-steering capability of ±70% have been measured. Finally, the use of RF-MEMS switches to reduce the unit-cell insertion losses and the transmit-array total power consumption has been investigated
Diaby, Fatimata. "Réseaux transmetteurs reconfigurables pour le dépointage et la formation de faisceau en bande millimétrique." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT125/document.
Nowadays, transmitarray antennas are of great interest for many civil and military applications in frequency bands between 10 and 110 GHz (5G mobile networks, point-to-point communication systems, radars, etc.).This thesis aims to make major innovations in modeling and design of transmitarray antennas for Ka-band applications (28-40 GHz). It focuses on the development of numerical tools, and the design and demonstration of several prototypes with advanced functionalities, such as passive (broadband or multibeam) and active (at electronic reconfiguration) transmitarrays.The first part of the work consists of a theoretical analysis of the transmitarray antenna. In a first step, the impact of the phase compensation method on the performance of the transmitarray is studied. The phase compensation law of the quasi-spherical wave incident on the array aperture is calculated using two methods called constant phase compensation and true-time delay (TTD) compensation. The numerical results show that TTD compensation allows an increase of the transmitarrays bandwidth and a reduction of the beam squint as compared to constant phase-shift compensation. In a second step, the operating principle of facetted transmitarrays is described in detail. The numerical simulation of a 3-facet transmitarray is validated through 3-D electromagnetic simulations. For a certain facet angle, the bandwidth and the beam scanning capability of the TA are improved at the expense of the gain.The next step of the work concerns the design and prototyping of two passive transmitarray antennas, one with a collimated and a large bandwidth, and the other with four fixed beams. The two transmitarrays are based on a 3-bit unit-cell providing two functions, namely the phase compensation and the polarization conversion from linear to circular. The passive beam-collimated transmitarray exhibits a measured gain of 33.8 dBi (corresponding to an aperture efficiency of 51.2%) and a 3-dB gain-bandwidth larger than 15.9%. The quad-beam transmitarray phase distribution has been optimized by a genetic algorithm code coupled with an analytical tool. The array is designed to radiate four beams at ±25° in the horizontal and vertical planes at the optimization frequency.The last part of the work aims to the design of a 27-31 GHz reconfigurable transmitarray antenna. Initially, an active unit-cell with four phase states (2 bits) in linear polarization was designed and validated experimentally. It consists of six metal layers printed on three substrates. The radiating elements are rectangular patch antennas, each of them including two PIN diodes to control the transmission phase. The operating principle of the unit-cell has been experimentally validated with a minimum insertion loss of 1.6-2.1 dB and a 3-dB transmission bandwidth of 10-12.1% for the four phase states. 0°, 90°, 180° and 270°.Then, this unit-cell was used for the design of a reconfigurable transmitarray antenna comprising 14 × 14 unit cells and 784 PIN diodes. A prototype was realized and characterized, it presents a measured maximum gain of 19.8 dBi, corresponding to an aperture efficiency of 23.5%, and a 3-dB bandwidth of 4.7 GHz (26.2% at 30.9 GHz). Despite some faulty elements, this prototype validates the operating principle and the feasibility of Ka-band transmitarray antennas with a 2-bit phase quantization. It is one of the first demonstration of such an antenna in the current state of the art
Duran, Venegas Juan Antonio. "Reconfigurable Metasurfaces for Beam Scanning Planar Antennas." Thesis, Toulouse, INPT, 2016. http://www.theses.fr/2016INPT0102.
We are studying the implementation of 'Scanning Antenna dedicated to the applications of satellite communications geostationary. The structures developed are suitable for to be on board an airplane or a train. The architecture of the antenna developed consists of a double linear network in two transverse dimmensions. The scan in each network is provided by the lines coplanar to metamaterials controlled by varactor. We porposons of new methods characterization of discontinuities coplanar online for the line design. In addition, a energy harvesting system has be designed to feed radiating elements and tested with patch different antennas. Finally, we are considering co-integration radiating structures and CRLH lines as well as control electronic by the diodes
Fechine, Sette Elmo Luiz. "Circuits intégrés millimétriques en bande Ka pour une antenne à pointage électronique pour les télécommunications avec des satellites géostationnaires ou des constellations de satellites." Electronic Thesis or Diss., Limoges, 2024. http://www.theses.fr/2024LIMO0002.
This work presents the design of active integrated circuits intended for integration into an electronically steered antenna for Ka-band satellite communications. Firstly, the manuscript introduces the context of the study, discussing the main concepts and characteristics of this type of antenna. Subsequently, two key blocks of the transmission chain are studied in detail and designed: a variable gain power amplifier and three controllable phase shifters. The circuits are implemented using two SiGe BiCMOS technologies: BiCMOS9MW and SG13G2. Finally, the post-layout simulation results are presented and compared to the project specifications as well as the state of the art
Breahna, Tudor Iulian. "Conception d'une antenne à bande élargie en technologie microruban, pour une antenne-réseau à balayage électronique." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ38037.pdf.
Yuan, Tangjie. "Antenne à métamatériaux pour les applications aéronautiques." Paris 10, 2012. http://www.theses.fr/2012PA100215.
This thesis concerns sub-project SP1 from “Matériaux et Structures Intelligentes pour l’Électromagnétisme” (MSIE) is a need for manufacturers will be constituting a genuine integration of antenna structures in aircraft structure as integrated equipment. This approach became possible through the use of new materials called "metamaterials" structures that could be used to form future integrated antenna structures on aircraft. We will evaluate the concepts of antenna structures embedded in the fuselage and/or drift plane. The thickness of the equipment should be less than 20 mm (excluding connector dimensions of 130 MHz -140 MHz). We will study two types of solutions: solution 1 and solution 2 respectively to the VHF frequencies. The first is a new compact antenna using a circular slot and shorted shorting-pins loading techniques behaves as a standard monopole antenna. The second antenna is the bent monopole antenna based a dual-layer EBG structure ground plane. The simulations and the optimizations of the two antennas were made in the VHF band. However, experimental facilities in the VHF are not available in our laboratory. The two antennas were again studied with a scale factor of 1/10 or 1/15 to operate around 1. 3 GHz or 2 GHz respectively. The performance of the two antennas (TOS, gain, radiation pattern) will be measured experimentally and compared with the theoretical results obtained by simulation. According to experimental results, one of the two configurations will be selected for the manufacture of an antenna at scale 1. This is the solution 2. This thesis is presented in three chapters: The first chapter presents the properties of a standard monopole antenna, and we will present a brief overview of the state of the art antennas. The second chapter, we present the design, optimization, and numerical and experimental characterizations of the circular slot antenna using the loading techniques: Solution 1. The simulated and measured results are in excellent agreement. An experimental bandwidth of 5. 1% (S11 = -10 dB) is presented with a maximum gain of 3. 7 dB at a frequency of 2. 04 GHz (in the azimuthal plane). In addition, several antenna parameters are analyzed to improve the antenna. Particularly, the bandwidth of the antenna has been extended to a wideband up to 11. 5% with an important role in radius of shorting pins. In the third chapter, we present the design, optimization, numerical and experimental characterizations of the metamaterials bent monopole antenna operating at 1. 3 GHz: Solution 2. A prototype of the antenna based on dual-layer EBG structure with a very low height (λo/36) was proposed and fabricated. The antenna was measured with a wide bandwidth of 24. 4% (S11 = -10 dB). The measured radiation pattern is represented with a maximum gain of 8. 7 dB. Results between simulations and measurements have a very slight difference. An array of the two identical metamaterials antennas disposed on both sides of the aircraft plane is to forms a Sabre-type antenna. The experimental radiation patterns are combined and analyzed. The antenna has a bandwidth ~ 24. 4% and a maximum gain of 8 dB at 1. 45 GHz. Finally, parametric studies based on all the validated experimentally simulating results are possible to improve in particular the bandwidth without major changes
Panaia, Patrice. "Reconfiguration dynamique d'une antenne pour partage de fonctions." Nice, 2006. http://www.theses.fr/2006NICE4084.
In this work, we present the frequency agile antennas study, and the design of such reconfigurable antennas based on RF MEMS. A state of the art on agile antennas an RF MEMS allowed to RF MEMS to choose the suitable devices. A first topic concerns a PIFA antenna with an open slot on the radiating element. The addition of a short circuit in a given position allows to obtain the resonance frequency shift. The short circuit made up, in a first time, with a piece of copper placed inside the slot, allows to model the MEMS active component? The final goal being to replace this short circuit by a RF MEMS placed on the radiating element, measurements were made to validate the concept. On this antenna, the MEMS position is optimized and the DC bias circuitry interactions are minimized, by using microstrip lines on the radiating element. Two prototypes of antennas with RF MEMS allowed to obtain the resonance switching. A second printed antenna fed by coplanar waveguide line was studied. This IFA antenna has to allow a switching between the bandwidth of the IEE802. 11b/g and IEE802. 11a/h standards. The switching is realized by two MEMS activated simultaneously. The first simulations were made by modelling the RF MEMS by two air gaps for the “OFF” state and by the whole structure for the “ON” state. A analyze on the location of the bias activation of the MEMS was made to optimize the concept. The passive structure gives results close to the simulation, but some frequency shifts can be observed on the active structure. Two types of packaged RF MEMS series switches were used. The first one is thermally actuated with a 2V bias. The second one, which os electrostatically actuated, needs 20 supply voltages. Therefore a new reconfigurable IFA antenna between ISM 24 and 61 GHz bands was simulated on a high resistivity silicon substrate to allow the integration of RF MEMS and the antenna
Damaj, Lana. "Antenne versatile intriquée." Electronic Thesis or Diss., Paris, ENST, 2013. http://www.theses.fr/2013ENST0010.
This thesis aims to develop wideband antennas interrelated with a filter, which we have defined as versatile intricate antennas. The antenna is versatile as it provides wide bandwidth (more than one octave) and has the capability to generate two orthogonal polarizations. On the other hand, the filter for harmonic rejection and the matching network are integrated parts of the radiating element and give it the intricate character.The first study is concentrated on designing a dual polarized antenna with a wide stop filter integrated to the feeding network. This filter enables to reject harmonics and unwanted response. The complete structure is compact with a size of 0.9 λ0x0.9 λ0, λ0 being the free space wavelength at the lowest frequency. In order to improve the compactness of the whole system and to cover more standards, we present a single and dual polarized wideband Harmonic Suppressed Antenna (HSA). This work explores the different techniques used to design a HAS. The proposed antenna is simple in structure but versatile in applications. In this approach, radiating element, filter for harmonic rejection and matching network, which are traditionally separated circuits, are incorporated into a single compact unit. The total size of the antenna is 0.53 λ0x0.53λ0. The final chapter aims to study the previous intricate antenna with a new wideband Artificial Magnetic Conductor (AMC) structure as reflector in order to obtain a low profile and directive antenna
Verhulst, Anne. "Intégration d'une antenne acoustique à haute résolution sur une plateforme multi capteur." Paris 11, 1995. http://www.theses.fr/1995PA112209.
Mensi, Mohamed. "Hyperthermie microonde : modélisation et contrôle d'une antenne multisource." Toulouse, INPT, 1986. http://www.theses.fr/1986INPT033H.
Books on the topic "Antenne à dépointage électronique":
Balanis, Constantine A. Antenna theory: Analysis and design. 3rd ed. Hoboken, NJ: Wiley-Interscience, 2005.
Blake, Lamont V. Antennas. 2nd ed. Silver Spring, Md: Munro Pub. Co., 1991.
Blake, Lamont V. Antennas: Fundamentals, design, measurement. Raleigh, NC: SciTech Pub., 2009.
Raj, Mittra, ed. Computer techniques for electromagnetics. Washington: Hemisphere Pub. Corp., 1987.
Connor, F. R. Antennas. 2nd ed. Edward Arnold, 1989.
Balanis, Constantine A. Antenna Theory: Analysis and Design. Wiley & Sons, Incorporated, John, 2016.
Balanis, Constantine A. Antenna Theory: Analysis and Design. Wiley & Sons, Incorporated, John, 2012.
Balanis, Constantine A. Antenna Theory: Analysis and Design. Wiley & Sons, Incorporated, John, 2012.
Balanis, Constantine A. Antenna Theory: Analysis and Design. Wiley & Sons, Incorporated, John, 2015.
Long, Maurice W., and Lamont V. Blake. Antennas: Fundamentals, Design, Measurement. Institution of Engineering & Technology, 2013.