Illustrative designs of multiband, wideband and EBG-enhanced antennas

The purpose of this paper is to review a number of innovative design concepts for multiband, wideband and EBG enhanced planar antennas. We begin by discussing two novel multiband antenna designs for multiple frequency applications. The first of these, which is based on fractal concepts, is a Sierpinski gasket type configuration. The second design combines a microstrip patch with a cylindrical dielectric resonator, and operates at multiple frequencies. Next, we describe a dual-band antenna design useful for WLAN applications. Finally, to round out the discussion, we turn to EBG-enhanced design. EBG materials are artificial dielectrics that comprise of a periodic array of metallic or dielectric elements, which exhibit stop-band and pass-band characteristics. We consider periodic dielectric structures, as well as frequency selective surfaces (FSSs) embedded in a background dielectric medium, which may be multilayered.