Fractal DGS based Novel Wideband Antenna for 5G Applications

A novel low-profile broadband slot antenna is proposed in this work. Instead of traditional slots, fractal-geometry based Defected Ground Structure (DGS) is configured for the very first time in the conventional slot antenna, to achieve the broadband radiation properties in 15.76-93 GHz frequency range. Proposed structure is printed on 1.52 mm thick, low loss substrate Rogers 4232, with a relative permittivity of 3.2. The overall dimension of the proposed structure is 25 mm×35 mm which can achieve at least 142% fractional bandwidth in its operating frequency range. Predicted, average gain of 4.3 dBi and the peak gain of 7 dBi is maintained in the entire frequency range by the proposed structure. Laboratory prototype of the antenna was fabricated and experimentally measured and measured S11 results are found to be in good agreement with the simulation results. Detailed investigation of radiation mechanism of the proposed antenna in such a wide frequency range is carried out by analyzing its surface current distribution at some intermediate frequencies. The proposed antenna can find its applications in short-range communication network for future mobile technologies like 5G.