STUDYING A METHOD TO DESIGN AN ANTENNA OPERATING AT DUAL-BAND FOR 5G APPLICATIONS BY COMBINING FRACTAL GEOMETRY AND METAMATERIALS

Abstract

This paper presents a method to design an antenna that operates in two bands 28 GHz and 38 GHz for 5G applications. The antenna configuration consists of a patch of modified fractal geometry combined with metamaterial structures that are split ring resonators arranged around the radiation component as a metasurface. The antennas were investigated and designed on a Rogers RT/duroid 5880 substrate with a dielectric constant of 2.2, the loss tangent of 0.0009, and a height of 0.6 mm, which are fed by a probe. HFSS software is used to simulate antenna configuration and operation. Compared with the original circular microstrip antenna, the proposed antenna operates in two bands with a bandwidth in the f₁ = 28 GHz band of  BW₁ = 2.35 GHz and a second band in the f₂ = 38 GHz of BW₂ = 8.45 GHz. Besides, the proposed antenna gain is also significantly increased 8.29 dBi. Physical models of the antenna were fabricated and measured to verify the correctness of the design.