Rectangular dielectric resonator antenna fed by offset tapered copper and graphene microstrip lines for 5G communications

In this paper, rectangular dielectric resonator antennas (RDRAs) fed by offset tapered copper and graphene microstrip lines are presented. A comparison between these two feeding materials is made with an aim of using the high-conductivity graphene film (HCGF) to replace copper for feeding the RDRA if feasible. Four feed forms have been discussed. The presented feed mechanism is able to couple electromagnetic energy in three different modes of the RDRA. The HCGF is utilized to replace copper for feeding the RDRA. An impedance bandwidth of 11.32% (3.25 GHz similar to 3.64 GHz) is realized in the experiments by using a graphene feed line, compared to that of 12.24% (3.22 GHz similar to 3.64 GHz) for copper, and a peak gain of 4.48dBi is obtained at the center frequency. The results show that the HCGF can be used to couple the RDRA, and the HCGF fed RDRA has good performance. Radiation patterns around the center frequency are also presented.