Dual-band beam tilting antenna with low profile negative refractive index metamaterial

A dual band negative refractive index metamaterial (NRIM) loaded beam tilting antenna has been proposed for 5G applications. The proposed antenna comprises of a dual band quarter wave bow-tie dipole with NRIM array fixed above the ground plane. The dual band NRIM unit cell is derived from the conventional double negative meta-material structure. When NRIM arrays have been integrated with dipole antenna at optimum distance and height, the main beam is deflected by 34.5 degrees and 45 degrees with peak gain of 8.1 and 8.93 dB at 2 and 3.5 GHz, respectively. Unlike the conventional beam tilting antennas, no gain reduction observed for both the bands when the beam is tilted, instead gain has been improved about 0.53 and 1.02 dB at lower and higher bands, respectively. Furthermore, the application of the proposed NRIM dipole in array antennas has been studied and discussed.