Gain Improvement of Millimetre-Wave Two Element Array Antenna for 5G Networks by Using Frequency-Selective Surface-based Reflector

This article proposes a two-element antenna array integrated with a reflector based on Frequency Selective Surface (FSS) of single layer to achieve a significant gain.Each of the antenna elements receives power from an individual port.The FSS-based reflector comprises 7 7 unit cells, each of which measures 2.8 x 2.8 mm 2 and exhibits multiband behaviour.The antenna is built on a Rogers RT-5880 substrate with a broad frequency range that spans 25 GHz to 30.3 GHz and 57.5 GHz to 80 GHz, encompassing millimetre wave bands (n275, V, and E) band.The suggested reflector exhibits stop-band transmission characteristics under the limit of -10 dB between 21.1 GHz -31.3 GHz and 47.65 GHz -80 GHz.The two-element antenna is combined with the proposed reflector, increasing gain from 6.7 to 11.1 dBi at 28 GHz, 8.7 to 10.75 dBi at 60 GHz, and 8.5 to 9.49 dBi at 73 GHz.The antenna's measurements are 20 x 16.5 x 0.87 mm 3 .The suggested antenna exhibits steady gain and directed radiation patterns.The modelling outcomes are validated realistically by examining the built prototypes of the suggested antenna design.