Ludovic Leger

Enhancement of gain and radiation bandwidth for a planar 1-D EBG antenna

This letter describes a technique to increase the radiation bandwidth and the gain of a classical planar electromagnetic band gap (EBG) antenna. Those two parameters are relative to the EBG material but also to the excitation, this second characteristic is studied here. The principle is to excite the EBG structure with several sources (instead of a single one classically). The performances depend on the number of sources and their spacing. Directivity and radiation bandwidth can be increased dramatically with few sources.

1D dielectric electromagnetic band gap (EBG) resonator antenna design

This article presents a new methodology allowing to design a planar electromagnetic band-pap antenna (choice of theebg material, sizing, feeding). This kind of antenna has already been presented.ebg antennas are very thin (compared with parabolic reflectors) high gain antennas. This article makes easier the realization ofebg antennas whatever the operating frequency, the gain, or still the bandwidth. A study about the sensitivity of the material properties on the performances is also presented. Finaly two exemples using this design method are described.RésuméCet article décrit une méthodologie complète inédite permettant de dimensionner et de réaliser une antenne planaire à bande interdite électromagnétique (Choix du matériau, de la configuration, dimensionnement, alimentation...). Le fonctionnement de ce type d’antenne a déjà été publié. Les antennesbie sont des antennes directives à encombrement réduit en épaisseur (En comparaison avec par exemple une antenne parabolique). Cet article facilite la réalisation des antennesbie quelques soient la fréquence, le gain ou encore la bande de fonctionnement. Une partie concerne également la sensibilité des éléments du matériau sur les performances de l’antenne. Enfin, deux exemples concrets utilisant cette méthode de conception sont présentés.

New advancements to exploit the potentialities of the EBG resonator antennas

In this paper we summarize the potentialities of the EBG resonator antenna. The theory to understand the properties of such antennas is developed and we illustrate these properties through the design of different kinds of EBG antennas.

Steerable and tunable "EBG resonator antennas" using smart metamaterials

The properties of the antenna depend on three structural parameters: the thickness separating the two parallel mirrors, the complex reflectivity of the partially reflective mirror and the radiation of the probes that are distributed between the two mirrors. This shows that a coordinated action on these parameters can lead to a smart EBG antenna. The design of one of the two mirrors constituting the EBG resonator with a smart metamaterial allowing the control of the reflectivity is the key to obtain both a tunable operating frequency and the beam steering adjustment. We show how the feeding antenna can be used to contribute to the beam steering. So we explore the possibility to build smart metamaterials including MEMS or diodes

Multifrequency and beam steered electromagnetic band gap antennas

EBG antennas are very thin and high gain antennas. They provide a great control of the power radiated. The antennas studied in this paper are realised with periodic dielectric materials. Classically they present directive patterns for one frequency band, but it is possible to design them to radiate directive patterns for multiple frequency bands. The methodology is described. It is also possible to control the direction of the radiated beam with this kind of periodic structure. This article explains how, with an appropriate feeding it is possible to control the direction of propagation and to create one main lobe. This technique is explained.

High Gain EBG Resonator Antenna

This paper describes how it is possible to increase the radiation bandwidth and the gain of a classical planar EBG antenna. Those two parameters are relative to the EBG material but also to the excitation, this second characteristic is studied here. The principle is to excite the EBG structure with several sources (instead of a single one classically). The performances depend on the number of sources and their spacing. Directivity and radiation bandwidth can be increased dramatically with few sources