Procédé pour fabriquer un substrat localement inhomogène d'un circuit hyperfréquence, substrats, circuits et interconnexions ainsi réalisés

Procédé pour fabriquer un circuit hyperfréquence (1) comprenant plusieurs sous-ensembles hyperfréquences (A, C, F1, F2). Ces sous-ensembles hyperfréquences (A, C, F1, F2) sont réalisés sur un même substrat (S), ce substrat (S) étant rendu localement inhomogène par intégration d'inserts (I) possédant des caractéristiques électriques appropriées dans une matrice (MA), de sorte qu'à chaque sous-ensemble est associée une zone de substrat présentant des caractéristiques diélectriques optimales pour ce sous-ensemble. Ce procédé permet de résoudre immédiatement des problèmes d'interconnexion et de couplage entre motifs et sous-ensembles.Utilisation à des fins de miniaturisation, notamment pour des systèmes embarqués et en téléphonie mobile

Proposed design solutions for low-cost flip-chip membrane devices for millimeterwave applications

International audienceThe membrane technology appears as a convenient solution for millimeterwave applications. An alternative low-cost polymer membrane process is proposed in this paper, and extended to the design of high performance antennas. Technological compatibility with standard process is also discussed, and an original Flip-chip concept is proposed for membrane antennas

Procédé pour fabriquer un substrat localement inhomogène d'un circuit hyperfréquence, substrats, circuits et interconnexions ainsi réalisés

Procédé pour fabriquer un circuit hyperfréquence (1) comprenant plusieurs sous-ensembles hyperfréquences (A, C, F1, F2). Ces sous-ensembles hyperfréquences (A, C, F1, F2) sont réalisés sur un même substrat (S), ce substrat (S) étant rendu localement inhomogène par intégration d'inserts (I) possédant des caractéristiques électriques appropriées dans une matrice (MA), de sorte qu'à chaque sous-ensemble est associée une zone de substrat présentant des caractéristiques diélectriques optimales pour ce sous-ensemble. Ce procédé permet de résoudre immédiatement des problèmes d'interconnexion et de couplage entre motifs et sous-ensembles.Utilisation à des fins de miniaturisation, notamment pour des systèmes embarqués et en téléphonie mobile

Association optimale entre éléments rayonnants et circuits passifs sur substrat composite

International audience

Comparative biological properties of the four stereoisomers of difethialone, a second-generation anticoagulant rodenticide, in rats: development of a model allowing to choose the appropriate stereoisomeric ratio

International audienceThe current management of rodent pest populations is based on second-generation anticoagulant rodenticides (SGAR). These molecules, of which difethialone is part, are much more efficient than the first generation. Nevertheless, this efficiency comes with a major drawback, SGARs are tissue-persistent that increases the exposure of rodent predators to them. According to its chemical structure, difethialone has four stereoisomers, whose specific inhibition potency and pharmacokinetic have never been described and might be useful to design new eco-friendly rodenticides. The study aimed to investigate the ability to inhibit anticoagulant target enzyme (VKORC1) and the pharmacokinetics in rats of the four difethialone stereoisomers in rats. We show that stereoisomers are all highly efficient to inhibit VKORC1 activity, but they have distinct initial half-life with 6.0h, 25.4h, 69.3h and 82.3h for respectively E4-trans, E2-cis, E1-trans andE3-cis stereoisomer. These results open the way of the development of eco-friendly and efficient rodenticide by mixing some of these stereoisomers. Preferential incorporation of the E4-trans stereoisomer (high inhibitory VKORC1 potency, relatively shorter liver half-life) into difethialone rodenticides baits might produce a more eco-friendly product than current commercially-available difethialone formulations. In addition, we put forward modeling to help design bait according to the circumstance of use (presence of non-target species, food competition, etc) by modulating the theoretical AUC and the theoretical concentration of the product at the death of the rodent pest. Thus, this modeling might allow to diminish the use of laboratory animal in assay

Association optimale entre éléments rayonnants et circuits passifs sur substrat composite

International audience

Accessing to UMTS filtering specifications using new microstrip miniaturized loop-filters

International audienceA new topology for the design of microstrip loop-filters is proposed in this paper. This new geometry is used in a coupled-loop-resonator filter in order to improve the out of band rejection (by introducing an additional transmission zero), as well as insertion loss (thanks to a significant circuit size reduction). The design methodology of these filters is first described and then experimental performances are discussed. Finally, a high performance duplexer, specified for UMTS frequencies and requirements (i.e. in the 1.9-2.17 GHz frequency band), is presented. Measured insertion loss is lower than 2.5 dB and an isolation level greater than 40 dB is achieved between Tx/Rx channels, thanks to the multiple out of band transmission zeros introduced in the filter synthesis

Antennes conformées 3D à large champ d'ouverture en rayonnement

International audienceA new topology for the design of wide-beamwidth planar antennas is proposed in this paper. This new geometry uses conformal patches inserted in a machine ground plane. The two equivalent slotline apertures of this low Q-factor resonator are located on the ground plane level, with a horizontal orientation of radiating E-fields. This contributes to minimize the parasitic coupling effects when implementing a complete antenna array with such new basic element. In the same time, a significant size reduction of the patch is performed through the elongation path due to the geometry shape. The design methodology is presented as well as a comparison between a regular patch antenna and the proposed design. Technological orientations are discussed and validated through experiments.A new topology for the design of wide-beamwidth planar antennas is proposed in this paper. This new geometry uses conformal patches inserted in a machine ground plane. The two equivalent slotline apertures of this low Q-factor resonator are located on the ground plane level, with a horizontal orientation of radiating E-fields. This contributes to minimize the parasitic coupling effects when implementing a complete antenna array with such new basic element. In the same time, a significant size reduction of the patch is performed through the elongation path due to the geometry shape. The design methodology is presented as well as a comparison between a regular patch antenna and the proposed design. Technological orientations are discussed and validated through experiments

High performance miniaturized microstrip antennas on locally non homogenous substrates

International audience

Filtres microrubans compacts à très forte sélectivité pour les terminaux mobiles de 3ème génération

International audience