A CPW-fed Super Wideband Dielectric Resonator Antenna

Abstract

In this paper, a coplanar waveguide (CPW)-fed super wideband (SWB) dielectric resonator antenna (DRA) is proposed. It consists of a rectangular DR situated at the center of the rectangular slot both excited by a tapered feedline. In addition, a circular stub is added at the top portion of the feed in such a way that it excites the DR efficiently. From simulation results, it is found that the presence of DR in the proposed antenna design improves the impedance matching throughout the band and hence enhances the impedance bandwidth by downshifting the lower cutoff frequency from 3 GHz to 1 GHz. It is observed that the proposed antenna achieved an impedance bandwidth of more than 175% ranging from 1 GHz to 15 GHz with a bandwidth ratio of more than 15:1. Besides, it is investigated that the presence of DR raises the peak gain from -5.6 dBi to 1.24 dBi at 1 GHz. It achieved a maximum gain of 7.2 dBi at 5.1 GHz. Further, the proposed antenna exhibits an almost stable radiation pattern in the entire frequency range.