Collinearly placed patch antenna arrays, printed on high permittivity dielectric substrates, suffer from an unwanted inter element coupling due to strong surface waves. A new shaped Defected Ground Structure (DGS) is proposed to suppress such waves in between elements. A low dimensional μ shaped DGS is carved out in between two E-plane patch antenn...
Silicon Carbide (SiC) power transistors are more and more used in electric energy conversion systems. SiC power semiconductors devices, such as SiC metal-oxide-semiconductor field-effect transistor (MOSFET) can operate at higher frequency and higher temperature compared to Silicon power MOSFET or insulated-gate bipolar transistor. However, the matu...
This paper deals with the electromagnetic wave scatteringfrom multi-layered media, containing random rough interfaces.It presents an extension of a basic asymptotic modelcalled the Kirchhoff-tangent plane approximation (KA) tomulti-layers. In order to be able to derive a simple expressionof the scattered intensity, further approximations mustbe mad...
In this paper, we study the electromagnetic scattering by an object buried inside a layer with two rough interfaces. We construct a rigorous mathematical model by using the integral equations in the frequency domain and discretize these equations by the method of moments. To reduce the complexity of the inversion of the resulting impedance matrix, ...
Ce travail traite de l’influence de l’algorithme d’équilibrage des tensions de type « RSF » et la modulation associée sur la dérive en tension aux bornes des condensateurs de sous modules sur des architectures MMC. Plusieurs modulations sont ainsi introduites, en explicitant leurs avantages et inconvénients en termes de qualité d’équilibrage (dispe...
Dans les convertisseurs de puissance, les circuitsde commande des composants de puissance, appelées ‘gatedrivers’,ont un rôle essentiel. De nos jours, ils intègrent de plus enplus de fonctionnalités telles que la détection du court-circuit debras, le blocage en douceur en cas de défaut, la surveillance de latension du composant de puissance à l'éta...
Cet article présente une nouvelle méthoded'estimation du courant de fuite de grille pour les composants detype MOSFET SiC. Cette méthode est directement intégrée dansun gate driver et permet d’assurer une mesure tant en mode « offline » que « on line ». Elle présente l’intérêt d’exploiter la structurenaturelle des gate drivers sans une complexifica...
Recent Modular Multilevel Converter (MMC) topology allow drastic improvements in power electronic conversion such as higher energy quality, lower power semiconductors electrical stress, decreased Electro-Magnetic Interferences (EMI), and reduced switching losses. MMC is widely used in High Voltage Direct-Current (HVDC) transmissions, as it offers t...
IoT networks have been omnipresent in urban and sub-urban areas since a few years ago. Even if all the IoT protocols do not use the same characteristics (modulation, resource sharing, transmit power, bandwidth), sometimes they share the same bands, which can inevitably lead to interference on the neighboring networks, and thus to a decrease in the ...
Evaluation of performance for complex applicationssuch as Artificial Intelligence (AI) algorithms and morespecifically neural networks on Multi-Processor Systems on aChip (MPSoC) is tedious. Mechanisms such as data-dependentpaths and communication bus congestion induce execution timevariation, which is hard to predict accurately using traditionalan...
