WorldCat Identities

Legay, Hervé

Overview
Works: 3 works in 4 publications in 2 languages and 5 library holdings
Roles: Opponent, Author
Publication Timeline
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Most widely held works by Hervé Legay
Conception d'une antenne bibande à large bande pour la téléphonie mobile by Jean-Marc Carrere( )

1 edition published in 2002 in French and held by 2 WorldCat member libraries worldwide

Guides à ondes lentes intégrés dans le substrat pour les applications en bandes RF et millimétriques by Matthieu Bertrand( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

The last decades have seen the evolution of communication networks towardgreater complexity and efficiency, being now able to carry significant data rates. This evolution is the result of both scientific and technological breakthroughs. Thanks to the wide bandwidths available at millimeter-wave frequencies, the future generations will be able to supply for the the increasing demand in multimedia services, especially high-definition videos. The design of wireless systems which operate at high frequencies with acceptable efficiency, costs, and minimum size thus constitute a decisive challenge. In this context, this work focuses on the development of passive circuits such as filters, couplers and waveguides which address these issues. We developed a miniaturization technique for printed circuits technology, which in a first step is dedicated to frequencies below 20 GHz. This technique is based on a slow-wave concept, defined as the property of any structure which impose lower velocities to the electromagnetic waves. A theoretical analysis, as well as design methods were established and confirmed by measurements. Secondly, we proposed two distinct technological solutions for the integration of efficient waveguides at millimeter-wave frequencies. This work was achieved in collaboration with two other laboratories. A theoretical study, design of test features and measurementswere performed. These results intend to constitute a basis for the future realization of miniaturized slow-wave circuits at millimeter-wave frequency bands
Modelisation d'antennes imprimees multicouches a plusieurs gravures de formes quelconques by HERVE LEGAY( Book )

2 editions published in 1991 in French and held by 1 WorldCat member library worldwide

CETTE THESE DECRIT L'ANALYSE D'ANTENNES MICRORUBANS MULTICOUCHES A PLUSIEURS GRAVURES DE FORMES QUELCONQUES. PLUSIEURS TYPES D'ALIMENTATIONS SONT ETUDIES COMME L'ALIMENTATION PAR COUPLAGE ELECTROMAGNETIQUE OU PAR EXCITATION COAXIALE. ELLES PEUVENT EGALEMENT ETRE CONNECTEES A DES TROUS METALLISES. LA METHODE D'ANALYSE EST CELLE DES EQUATIONS INTEGRALES. LES FONCTIONS DE GREEN 3D DES STRUCTURES MULTICOUCHES SONT CALCULEES. UNE METHODE DE MOMENT EST DEVELOPPEE, AVEC L'INTRODUCTION D'UN MODE D'ATTACHE EXPRIMANT LA CONSERVATION DES COURANTS A LA JONCTION DES CONDUCTEURS HORIZONTAUX ET VERTICAUX. ON PEUT ALORS EXTRAIRE CERTAINES CARACTERISTIQUES RADIOELECTRIQUES DES ANTENNES MICRORUBANS COMME L'IMPEDANCE D'ENTREE ET LE CHAMP RAYONNE. DES ETUDES PARAMETRIQUES SONT ALORS MENEES SUR PLUSIEURS STRUCTURES D'ANTENNES DONT CERTAINES SONT ORIGINALES. DES INTERPRETATIONS PHYSIQUES DES PHENOMENES SONT PROPOSEES. AFIN D'ENVISAGER LA SYNTHESE D'UNE ANTENNE DANS LE CADRE D'UNE C.A.O. SIMPLE, UNE PROCEDURE EST PROPOSEE ET CONDUIT A L'ELABORATION DE TABLES MULTIDIMENSIONNELLES QUI SERONT INSEREES DANS DES SIMULATEURS COMMERCIAUX DE CIRCUITS MICROONDES
 
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Audience Level
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Audience level: 0.96 (from 0.93 for Modelisati ... to 0.97 for Conception ...)

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