Double annular-ring dielectric resonator antenna for ultra-wideband application

A new dielectric resonator antenna (DRA) is proposed in this article for ultra-wideband (UWB) application. A larger annular-ring DRA is placed concentrically outside a smaller one to form a double annular-ring DRA. The antenna is operating at the end-fire mode. The effects of antenna parameters, such as the radiuses and heights of the dielectric resonators as well as the probe length are investigated. The proposed double annular-ring DRA can offer an impedance bandwidth up to 3-11.2 GHz for a return loss less than - 10 dB. The radiation patterns are stable in the passband. (c) 2006 Wiley Periodicals, Inc.