A T-shaped compact dual-band MIMO antenna system for 5G smartphone applications

Multiband MIMO antenna system is very important in 5G mobile communication to meet the requirements of increasing data rate. However integrating multiple antennas in the limited space causes mutual coupling. The antenna configuration gets more intricate, if additional circuitry is installed to obtain greater isolation and hence, the occupied area on the board grows significantly, making the overall antenna design bulky. Hence, to provide dual band coverage, decent isolation and compact design, a compact MIMO antenna system is presented in this paper. The proposed system includes a T-shaped resonating structure that is employed on the side-frames to form a MIMO system with eight antennas. The T-shaped strip is designed to resonate at two frequencies and thereby covering two 5G bands (LTE 42/LTE 46). The proposed dual band MIMO system is fairly compact as the individual antennas are mounted on the 150×3.6mm2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$150\times 3.6 {\text {mm}}^{2}$$\end{document} side-frames of the smartphone. The isolation between antenna elements is 14 dB. This is accomplished without the need of a decoupling structure or a complex tuning process. The ergodic channel capacity realized by the suggested MIMO system in the operational bands is more than 41 b/s/Hz and ECC is less than 0.075. The impacts of the presence of plastic frame, display panel and phantom hand on the performance of proposed design are discussed. The proposed design provides compactness, dual band coverage and high isolation.