An eight-element multi-band MIMO antenna system for 5G mobile terminals

Abstract

A compact low-profile self-isolated Multi Input Multi Output Antenna (MIMO) Array is presented for the 5G smartphone devices. The proposed system consists of eight antenna elements operating on triple bands, which are (1.83 - 2.21) GHz for the extended Personal Communication Purposes (PCS) n25 and other related applications, the china mobile band n79 (4.8-5) GHz, and the WLAN (5.15-5.97) GHz applications. The proposed antenna element is designed based on a hybrid of modified Minkowski and Peano curves fractal geometries. All antennas are printed on the surface layer of the main mobile board and the size of the antenna is (11.47 mm×7.19 mm). Good isolation is achieved (better than 10 dB and 13.5 dB in the lower band and the higher bands, respectively) without employing any additional decoupling elements and/or isolation techniques. For evaluating the performance of the proposed antenna element, the S-parameters, antenna gains, antenna efficiencies, and antenna radiation characteristics are considered. To assess the MIMO performance of the proposed antenna array, the Envelope Correlation Coefficients (ECCs) and Mean Effective Gains (MEGs) are investigated. Desirable antenna and MIMO performances are attained so the proposed system can be considered as a good candidate for the 5G mobile smartphones.