Bandwidth and Gain Enhancement Technique for Gammadion Cross Dielectric Resonator Antenna

Abstract

In this paper, a novel slot-technique is presented to enhance the bandwidth and gain of dielectric resonator antenna (DRA) with two different geometries. First geometry of DRA is Gammadion Cross DRA with semi-cylindrical slots (GCDRA-1), and the other is Gammadion Cross DRA with rectangular slots (GCDRA-2). It is found that the cutting slots can be used to widen the DRA bandwidth or to tune the DRA frequency. Iterations of cutting slot in dielectric resonator are embedded on single structure of DRA. The new Gammadion Cross structure of proposed DRA offers a good impedance bandwidth of 31.6 % for |S11| < −10. In addition, the proposed antenna has a quite higher and more stable gain. The peak gain of proposed antennas is ~7 dBi at 5.1 GHZ. The antenna covers most of wireless systems like C-band, 5.2, 5.5 and 5.8 GHz-WLAN and Wi-MAX applications. The simulation process has been done using CST Microwave Studio™. It is observed that the new proposed Gammadion Cross configuration (GCDRA-2) reduces the DRA volume by 50 % and at the same time enhances the bandwidth from 10 to 31.6 % for |S11| < −10 than the reference antenna. The performance parameters of proposed DRA like reflection coefficient, peak gain and impedance bandwidth has been evaluated and verified these finding with two different Gammadion Cross DRA structures.