Antenna beam tilting and gain enhancement using novel metamaterial structure at 28 GHz

Abstract

This paper introduces an antenna beam tilting in azimuth-plane at a 5th generation (5G) candidate band, 28 GHz. The proposed antenna is dipole antenna and the beam tilting is achieved using array of metamaterial (MTM) unit cells. The new square range resonator (SRR) unit cell is composed of a one range included into square shape. Integration of SRR array in the dipole antenna allows to create different refractive index and consequently tilt the main beam of the original antenna in both positive (+24 degrees) and negative (−25 degrees) directions. Furthermore, there is a gain enhancement through the deflection process by 1.87 dB (positive tilt) and 1.84 dB (positive tilt) compared to the antenna with no SRR unit cells. In addition, the return loss of the original antenna corresponds well with that of the antenna loading by SRR array.