FORTINO , Nicolas

The recent use of Ultra Wide Band technology in telecommunication implies the study of appropriated antennas. This thesis presents the needs of efficient and characterized antennas but also the keys related to their conception. A state of the art of UWB antennas is proposed and a bow-tie structure is chosen for optimization. A novel triangular...

National audience

National audience

This chapter is devoted to the presentation of the various antennas that present ultra wide band impedance matching, and some techniques to improve their performances. In order to better understand their behavior, these structures are classified by categories presenting each precise specificity. The chapter presents the frequency independent...

The purpose of this letter is to model the three-dimensional radiation pattern of an ultrawideband antenna in near-field region. This compacting process can be established by combining spherical vector wave expansion and Cauchy methods. Spherical basis possesses the advantage of handling both radial and angular behavior, whereas the Cauchy...

A novel Double Exponentially Tapered Slot Antenna (DETSA) for microwave imaging applications is presented. To extend the antenna's impedance bandwidth toward low frequency, an absorbing material is stacked on the antenna sides. The measured reflection coefficient (S11) of the antenna confirms that the absorbing material increases the bandwidth...

This paper presents an application of the Matrix Pencil (MP) method to modelize UWB exponential Tapered Slot Antenna (ETSA) radiation performances. The determination of the 3D Impulse Response of Antenna (IRA) is performed starting from measured data. Using the Matrix Pencil method, we establish a compact model of the antenna. A new criterion...

A novel Double Exponentially Tapered Slot Antenna (DETSA) for microwave imaging applications is presented. To extend the antenna's impedance bandwidth toward low frequency, an absorbing material is stacked on the antenna sides. The measured reflection coefficient (S11) of the antenna confirms that the absorbing material increases the bandwidth...

National audience

Recent advances in wideband impulse technology, low power communication along with unlicensed band have enabled ultra-wide band (UWB) as a leading technology for future applications. This paper outlines an Impulse Radio Ultra Wideband (IR-UWB) application focusing on the design of the antennas and especially on the excellent isolation between...

Recent advances in wideband impulse technology, low power communication along with unlicensed band have enabled ultra-wide band (UWB) as a leading technology for future applications. This paper outlines an Impulse Radio Ultra Wideband (IR-UWB) application focusing on the design of the antennas and especially on the excellent isolation between...

The application of Babinet's principle to the ultra-wideband (UWB) differential planar printed antenna is presented. This electromagnetic technique is applied to a classical monopole UWB antenna, and can also be applied to most types of printed antennas. It permits grouping on the same substrate of two antennas close to each other, operating in...

The application of Babinet's principle to the ultra-wideband (UWB) differential planar printed antenna is presented. This electromagnetic technique is applied to a classical monopole UWB antenna, and can also be applied to most types of printed antennas. It permits grouping on the same substrate of two antennas close to each other, operating in...

National audience

Ce papier détaille l'étude d'un démonstrateur ultra large bande fonctionnant dans la bande 3-5 GHz. Ce démonstrateur est composé de deux antennes : une antenne d'émission (Tx) et une antenne de réception (Rx). Ces deux antennes partagent le même plan de masse et sont positionnées l'une à coté de l'autre sur un même PCB. Elles sont également...

Ce travail aborde le problème de la classification d'objets à partir de leurs signatures électromagnétiques en utilisant des réseaux de neurones convolutifs (ou CNN pour Convolutional Neural Network). La classification porte à la fois sur la forme, le matériau et l'orientation spatiale de l'objet dans un repère défini par la position des...

National audience

Ce travail aborde le problème de la classification en utilisant des réseaux de neurones convolutifs (CNN) pour discriminer des objets à partir de leurs champs diffractés ultra-large bande. L'objectif est de démontrer que les données prétraitées par une méthode d'expansion en singularités (SEM) offrent une plus grande précision de...

Two novel antennas for UWB communications, both inspired from bowtie and triangular patch structures, are presented and tested. This paper proposes their study and optimization in order to cover the new WPAN standard and facilitate their integration on communication devices. This work has then been centered around three specific goals: wide...

This paper describes a linear combination of Spherical Vector Wave Expansion (SVWE) and Singularity expansion methods (SEM) to compress the radiation pattern of ultrawideband antennas and its application to Through-The-Wall (TTW) measurements. This process is applied and compared between simulated and experimental data in free space and in TTW...