EBG resonator antennas: State of the art and prospects

This article presents the recent developments on Electromagnetic Band Gap (EBG) resonator antennas. After reminding the working principles of such radiating devices, a state of the art is presented to show main applications of these antennas in cluding high directivity solutions, multiband devices, omnidirectionnal coverages, focal feeds for reflector and tuning. Finally, some prospects are given for future im provements.