Mutual Coupling Reduction Between Ultra-Wide Band Antennas for Millimeter Wave Applications

This paper proposes a monopole antenna with an ultra-wide band (UWB) for the 5G millimeter wave applications, by enhancing the circular monopole antenna's resonant structure the crescent-shaped monopole antenna is proposed. A rectangular slot was added to the ground to improve the antenna feed and extend the antenna impedance bandwidth. The antenna is supplied by a 50-ohm microstrip line. The suggested antenna meets the -10 dB return loss bandwidth requirement from 15.2 to 57.2 GHz, according to simulation findings. The antenna gain is more than 3.4dBi in the 15GHz to 27.5GHz band and greater than 4dBi in the 27GHz to 40GHz range. Surface currents between the antennas cause mutual coupling in these sorts of antenna arrays, which lowers the system performance. Mutual coupling between antennas will be decreased by adopting metamaterial unit cell of spiral ring resonator.