Performance Enhancement of Hemispherical Dielectric Resonator Antenna by Using Artificial Materials

Abstract

—This paper investigates the use of artificial materials (electromagnetic band-gap structure)for the performance enhancement of hemispherical dielectric resonator antenna. It isshown that reduction of surface waves improves the performance of the dielectric resonator antenna considerably. Conversion of surface waves into the radiated waves is achieved by the electromagnetic band-gap structure.The electromagnetic band-gap substrate is  made of two periodic structures.One periodic structureconsists of circularrings and the other periodic structureis made of metallic viaswhich are placed radially and circularly.These viasconnects the circular rings to the ground.HFSS software is used to optimize the periods of two periodic structures. The integration of hemispherical DRAand anelectromagnetic band-gap substrate improves the antenna performance. It isobserved that the EBG structure enhances the antenna gain and antenna bandwidth by 2.6 dB and35 MHz respectively. The dielectric resonator antenna structure is simulated bythe simulator HFSS.