Slot-fed wideband dielectric resonator antenna for wireless applications

Abstract

In this paper, a slot-fed dielectric resonator antenna (DRA) with wideband operations in 4-6 GHz frequency band is presented. Slot represents coupling mechanism between resonators and the microstrip line. The DRA and slot are both resonant structures. The microstrip feed line is positioned at right angle to the center of the slot for efficient coupling. Together they yield a double resonant structure with low cross-polarization levels and identical radiation patterns. With proper design, the two resonances can be merged to achieve wide bandwidth. The rectangular dielectric resonator placed at the center of the rectangular ring slot provides an impedance bandwidth of 42.1%. The return loss and radiation patterns of these are presented.