###### Abstract
Multiple antennas must cohabit in the limited space of transmitters and receivers [20] in order for the combinative system to function. In other words, the combination of UWB and MIMO technologies, as well as the utilization of space multipath and parallel transmission of numerous signals, may provide obvious multiplexing and diversity gain, as well as long-distance signal transmission stability [21; 22; 23; 24; 25]. In real situations, this combination can also resolve multipath fading. When considering single antennas, features such as wide BW throughout the full working BW and improved isolation from nearby arrays come to mind. In the UWB-MIMO system, however, this is not the case. Because as the number of arrays rises, the coupling effects become more severe. This mutual coupling effect distorts antenna radiation patterns, changes antenna impedance matching, and causes correlation in sent or received signals, resulting in a decrease in MIMO system capacity [26; 27]. Mutual coupling between each antenna element is unavoidable in a MIMO system, and it has a detrimental impact on the antenna's properties. It degrades pattern correlation and radiation efficiency. In MIMO and array antennas, the decoupling approach is used to suppress mutual coupling (improve isolation) [28]. As a result, an effective strategy for decoupling should be adopted. The most basic method of decoupling is to increase antenna separation distance; however, the size of each component must be closely regulated for downsizing UWB mobile terminals. The right approach is to create a unique structure that reduces coupling without compromising transceiver space. The most frequent decoupling structures for plane monopole MIMO antennas are parasitic components and defective grounds [29; 30]. Another method for creating polarization and pattern diversity in UWB-MIMO antennas is to utilize slot antennas with orthogonal feeding [31; 32]. Several bands have been used for 5G communications including 3.4-3.6 GHz known as LTE and 3.4-3.8 GHz [33; 34]. To satisfy the communication system's criteria, a MIMO system must offer excellent constancy while maintaining a low HPBW value [35]. Several approaches exist for decreasing mutual coupling, involving utilization of neutralization lines [36; 37], parasitic components loading [38], and decomposition methods [39]. Not all these approaches might be used efficiently in a MIMO system and cannot be appropriate for Massive MIMO systems. In contrast, metamaterial (MTM) and metasurface structureshave showed promises in terms of improving mutual coupling. They are, however, constrained by the amount of design components that may be introduced [40; 41; 42; 43]. As specified in [44; 45; 46; 47; 48], certain 5G antennas must be de-signed with small dimensions. Because the single-mode antenna components utilized to construct MIMO antennas, they had a poor data rate, a restricted BW, and a limited gain [3]. This paper is divided into four pieces. Section 1 begins with a detailed overview of current articles on MIMO antennas, their technology, and the problems associated with 5G communication systems. Section 2 shows the suggested MIMO antenna and design processes of metamaterial, as well as their performance evaluation. After evaluating the antenna's ability to operate as a high isolation and efficiency MIMO antenna, four elements combined on an individual textile to be considered as a wearable eight-ports MIMO antenna. Section 3 presents the findings of this investigation. Finally, Section 4 contains the final observations.