Dual-Band Eight-Element MIMO Array Using Multi-Slot Decoupling Technique for 5G Terminals

Wei Hu,Steven Gao,Ying Liu,Le-Hu Wen,Qi Luo,Hang Xu,Xuekang Liu,Wei Wang,Long Qian

doi:10.1109/access.2019.2948639

Abstract

This paper presents a dual-band eight-element multiple-input multiple-output (MIMO) array using a multi-slot decoupling technique for the fifth generation (5G) mobile communication. By employing a compact dual-loop antenna element, the proposed array obtains two broad bandwidths of 12.2% and 15.4% for sub-6GHz operation. To reduce the mutual coupling between antenna elements, a novel dual-band decoupling method is proposed by employing a multi-slot structure. The proposed MIMO array achieves 15.5-dB and 19.0-dB isolations across the two operating bands. Furthermore, three decoupling modes generated by different bent slots can be independently tuned. Zero ground clearance is also realized by the coplanar arrangement of the antenna elements and decoupling structures. The proposed MIMO array was simulated, fabricated, and measured. Experimental results agree well with the simulations, showing that the dual-band MIMO array has good impedance matching, high isolation, and high efficiency. In addition, the envelope correlation coefficient and channel capacity are calculated and analyzed to validate the MIMO performance of the 5G terminal array. Such a dual-band high-isolation eight-element MIMO array with zero ground clearance is a promising candidate for 5G or future mobile applications.

Highlights

With the rapid evolution of mobile communication technologies, the fifth generation (5G) wireless systems have been attracting an increasing interest in recent years, due to their advantages of large channel capacity, high spectral efficiency, and massive connection density [1]
High isolations between antenna elements are obtained, which are better than 15.5 dB and 19 dB in the lower and higher bands, respectively
A novel method to design a dual-band multipleinput multiple-output (MIMO) array using the multi-slot decoupling technique is presented in this paper

Summary

Introduction

With the rapid evolution of mobile communication technologies, the fifth generation (5G) wireless systems have been attracting an increasing interest in recent years, due to their advantages of large channel capacity, high spectral efficiency, and massive connection density [1]. W. Hu et al.: Dual-Band Eight-Element MIMO Array Using Multi-Slot Decoupling Technique for 5G Terminals

Results

Conclusion