Efficient design of rectifying antennas for low power detection

ISSN : 0149-645X E-ISBN : 978-1-61284-756-6 Print ISBN: 978-1-61284-754-2 INSPEC Accession Number: 12240657International audienceThis article is dedicated to the design of rectifying antenna for wireless energy transfer at 2.45 GHz and low input power (−10 dBm). Specific design guidelines must be respected to optimize the structure. Different rectifying circuits have been studied and their performances have been evaluated. The effects of the antenna impedance have been investigated to improve the performances. Two test-circuits have been manufactured and measured to validate the interest of a global design approach

Caractérisation des performances d'antennes à réflecteurs paraboliques illuminées par une source focale BIE. Application à l'optimation d'une couverture multimédia multifaisceaux

soutenue le 16 octobre 2007Thèse université de Limoge

Sub-reflectarray performances for reconfigurable coverages

International audienceA reconfigurable sub-reflectarray (RSRA) is studied to perform a realistic telecommunication scenario in Ku-band. The reflectarray panel is based on a proven technology with PIN diodes developed by Thales Airborne Systems and French Space Agency. This article presents different geometries of dual-reflector that can be used with this RSRA and the performances are compared, including quantization effects. It also presents that the main difficulty to tackle with RSRA is the alteration of the radiation patterns due to the specular radiation of the panel. Finally, two solutions to minimize this effect with RSRA are presented

Potentialities of reflector antennas with reflectarray feeds for reconfigurable coverage

International audienceConclusion The different results obtained with this antenna concept show some interesting potentialities. Indeed, directivities above 34 dB can be obtained on different shaped coverages without too much complexity for the reflectarray design and with an interesting compactness gain compared to classical dual reflector antennas. Moreover, the number of cells can be limited to a value below 2000 thanks to the reflector whereas more elements would have been necessary with a single reflectarray. This reduction is an important fact for the active cells consumption and manufacture. Another interest of this solution is the versatility of the active reflectarray panel. Once the optimized phase shifts have been synthesized, the panel has just to be electronically driven. A combination of several elementary panels can also be foreseen for versatility and manufacture easiness, which is contributing to a cost reduction. Other works on this concept are currently led to improve the performances and to afford flexibility on more than two coverages with a reduced cell numbers

Reflectarray antennas with accurate calculation of phase shifts

International audienceThis article presents a new approach to analyze a reflectarray antenna and calculate the phase shifts needed to generate a beam in a given direction. The method is used with a two layer reflectarray including local ports. Reactive loads on the rear panel allow a beam control. The method described combine full-wave simulation and analytical formulation to obtain both accuracy and versatility

Systematic Design of Parasitic Element Antennas - Application to a WLAN Yagi design

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Stacked Patch Antennas Appropriate for Remotely Piloted Aircraft Applications

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Potentialities of Hybrid Arrays with Parasitic Elements

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Mise au point d'antennes à éléments parasites large bande à polarisation circulaire

National audienc

Système électronique comportant un mode de veille sans consommation électrique

Également publié en tant que : US9819198B2 CA2865358A1 WO2013132016A1L'invention concerne un système électronique (1), comprenant : -un émetteur électromagnétique radiatif (2) d'émission d'un signal d'activation incluant séquentiellement un signal d'alimentation suivi d'un signal d'identification, la puissance du signal d'alimentation étant au moins dix fois supérieure à la puissance du signal d'identification ; -une interface de connexion à une source d'alimentation (6) ; -une charge électrique (71) ; -un circuit (5) de désactivation d'une mise en veille de la charge électrique, incluant : -un récepteur (3) comprenant : -une interface de réception ; -un redresseur configuré pour générer une tension d'activation continue à partir d'un signal d'activation ; -un interrupteur (4) configuré pour sélectivement connecter/déconnecter la charge (71) de l'alimentation ; -un circuit d'identification configuré pour extraire un identifiant du signal d'activation et configuré pour appliquer la tension d'activation comme signal de commande de fermeture de l'interrupteur (4) si une concordance de l'identifiant est déterminée