5G MIMO Antenna Designs for Base Station and User Equipment: Some recent developments and trends

5G multiple-input, multiple-output (MIMO) antenna systems will be an important pillar in realizing the new standard. The key advantages that MIMO provides are high data rate, low latency, and high reliable communication. The main objective of this article is to present a comprehensive review, recent trends and development of sub-6 GHz and millimeter wave (mm-wave) MIMO antenna designs for next-generation wireless communications. This work features MIMO antenna designs for both base station (BS) as well as handheld devices for 5G communications. A state-of-the-art literature review is presented to report the recent developments in sub-6 GHz 5G MIMO, integrated 4G, and mm-wave 5G MIMO, mm-wave 5G MIMO antennas, and mm-wave massive-MIMO (m-MIMO) BS antenna designs for the first time in a comprehensive manner. Moreover, the challenges associated with 5G communication are also discussed.