5G mobile communication systems 1 Antenna arrays 1 Antenna feeders 1 Base stations 1 Beam scanning 1 Conventional lens 1 Current structure 1 Feeding networks 1 G-frequency band 1 High frequency operation 1 Lens antenna 1 Lens antennas 1 Mobile base station 1 Multibeam 1 Negative refractive index 1 Refractive index 1 Wide angle beam scanning article 1 energy conservation 1 refraction index 1 simulation 1