Single layer polarization independent reflectarray antenna for future 5G cellular applications

This paper presents a reflectarray antenna working at 28 GHz with polarization independent characteristics. The unit cell is composed of three circular rings optimized to achieve linear phase characteristics with the variation of the unit cell size. The array is composed of 400 unit cells of variable size arranged in a square shape aperture in order to direct the reflected wave in a direction normal to the reflectarray surface. The simulation results of the array with CST software show a directive beam with a low side lobe level, a gain of about 25 dB, and an efficiency of 58% at 28 GHz, which makes this array suitable for 5-G applications that may work at 28 GHz.