15 research outputs found

    Radio sur fibre pour un réseau local domestique millimétrique

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    National audienceLe projet FUI ORIGIN (Optical-Radio Infrastructure for Gigabit/s Indoor Networks) adresse le marché du Réseau Local Domestique pour lequel il propose une nouvelle infrastructure à très haut débit associant un câblage à fibre optique avec une diffusion radio 60GHz. Les premiers tests de cette infrastructure ont donné des résultats probants : un lien Radio sur Fibre en fréquence intermédiaire étendant la portée d'une transmission radio millimétrique est ici proposé et caractérisé complètement en termes d'EVM. Ce concept est validé par l'utilisation de produits commerciaux Wireless HD. Les études se poursuivent pour intégrer les systèmes optique-microondes en utilisant des composants bas coûts et innovants, comme les phototransistors SiGe/Si et des VCSEL analogiques

    Liaison sans fils à 60 GHz et réseau domestique multi-gigabit/s basé sur une infrastructure radio sur fibre bas coût

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    National audienceLe projet FUI8 ORIGIN (Optical Radio Infrastructure for Gigabit/s Indoor Network) s'adresse au marché du Réseau Local Domestique (RLD) en proposant une infrastructure bas coût qui combine l'efficacité de la fibre optique pour la diffusion radio avec les avantages d'une transmission sans fils. Les premières réalisations et les tests réussis sont présentés dans ce papier

    Antenne compacte VHF pour la gestion du réseau électrique

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    National audienceENEDIS pilote le réseau électrique françaisvia un réseau radio en bande VHF. L’opérateur souhaitedisposer d’une solution antennaire compacte,omnidirectionnelle, intégrée aux armoires detélécommande des organes de manoeuvre télécommandés(OMT) du réseau de distribution électrique, commealternative aux antennes encombrantes de type perche ouYagi. Cet article présente la conception et la réalisationd’une antenne compacte pseudo-PIFA (Planar InvertedF Antenna) pour les réseaux de télécommanded’ENEDIS dans la bande des 68,4 - 73,1 MHz

    Miniaturization of an UWB Dual-Polarized Antenna

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    International audienceFor some UWB applications (short range radars,medical imaging), it has been shown that the use of an antennathat supports a dual-polarization can enhance their accuracy.However, the size of classic UWB dual-polarized antennas makestheir integration into small devices difficult. As size becamecrucial, miniaturization techniques have been previously investigatedin an UWB context. In this paper, we aim to provide anelectrically-small UWB antenna with a dual-polarized radiationpattern. A planar miniaturization technique has been investigatedon a dual-polarized sinuous antenna. A size reduction of 32%has been achieved without compromising on either bandwidth orradiation performances

    Study of an Electro-Optic Polymers Leaky Waveguide Deflector and its Microwave access across a GCPW to CMS transition for realizing a 40 GSPS AOADC

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    International audienceDesign challenges and performance optimization of an all-optical analog-to-digital converter (AOADC) is presented here. The paper addresses both microwave and optical design of a leaky waveguide optical deflector based on electro-optic (E-O) polymer. The designed E-O deflector should allow an AOADC operating over 44 giga-samples-per-seconds (GSPS) with an estimated effective resolution of 6.5 bits and power consumption of only 4W. In addition, for ease of access from both optical and RF perspective, via-holes less broad bandwidth transition from grounded coplanar line to coupled microstrip line (GCPW-CMS) is designed and realized. Measurement results for the back-to-back configuration of this transition are reported with a bandwidth of over 35 GHz

    Design and realization of high-performance microwave and millimeter wave band-pass filters on thin polymer films

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    International audienceThis paper reports the design and manufacturing of microstrip band-pass filters with good performance in terms of both insertion loss and selectivity. The proof of concept is carried out on thin BCB polymer (70 µm) film very used in microelectronics thanks to its low loss tangent (tanδ = 0.0025). The studied filters are constituted of two resonators and they combine the compactness of microstrip resonators and the connection facility of coplanar pads due to microstrip - grounded coplanar waveguide transitions integrated with the filters

    Experimental analysis of microwave backscattering on a wave tank

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    International audienceIn order to validate models of electromagnetic wave scattering by rough surfaces, a laboratory experimental setup of microwave scattering by a water surface is implemented above a wave tank. This wave tank facility allows to produce controlled waves and, therefore, to acquire signals with known conditions. The current monostatic configuration permits to record the signal backscattered after reflection from the water surface. Measurements are acquired for several angles of view and for various conditions of waves. The analysis of measurements permits to study the effect of electromagnetic parameters (frequency, incidence angle of antennas, ...) and hydrodynamic parameters (wave type, height and wavelength, ...)
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