A Wideband Dielectric Resonator Antenna with Truncated Ground for 5G Applications

In this paper, we propose a wideband antenna that consists of two closely separated dielectric resonator antennas (DRAs), and fed by a microstrip antenna, for 5G applications. The dimensions of the two DRAs are designed such that they resonate at two close and contiguous resonance frequencies to enhance the antenna bandwidth. Moreover, a truncation in the ground has been proposed such that the feeding microstrip antenna attains a third resonance frequency that is close to the resonances of the two DRAs. As such, the three resonance frequencies form a wide contiguous bandwidth of 12-24GHz, with fractional bandwidth of 66%, at center frequency of 18GHz. Furthermore, the utilization of the two closely separated DRA elements enhances the gain of the antenna as they act as antenna array elements, whereas there is only one feeding port, which simplifies the antenna structure. The DRAs widths and lengths are 2 by 2mm and 5 by 1mm, respectively, and the height of both of them is 5.7mm. The gain of the antenna ranges from 4 to 8dBi over the operating bandwidth. The antenna is fabricated and good agreement is attained between measured and simulated results.