 serious concern for researchers. The narrow bandwidth characteristics of 15-50% for general antennas in most wireless devices, such as dipoles and wave- guide horns, were previously considered to be a severe constraint. There are various challenges for researchers to consider when it comes to antenna design. The majority of modern communication antennas have complex designs with uneven patch as well as dielectric substrates. Another important and difficult topic for antenna researchers to consider is antenna size reduction. The qualities of these sorts of antennas can also be affected by geometry related to mounting device upon which they are installed. It is now necessary to have a high bandwidth with a small antenna size and an easy design. In this study, authors present a structure for a compact 4-Port MIMO antenna related to applications for the IoT, with the key to obtaining a small size being careful design development while keeping acceptable electrical performance. By boosting signal quality, an MIMO system may improve system capacity, throughput, and QoS (quality of service), as well as reduce fading effect, lower tapping susceptibility, and improve system coverage. Microstrip antennas provide several advantages over other antenna types, including ease of fabrication, lower cost, multiband capability, small size, supports for both circular and linear polarizations, and the ability to be mounted on a hard surface. In microstrip MIMO antennas, surface waves play an important role in mutual coupling. In a MIMO system, there is a 'trade-off' between coupling and antenna size. Due to the restricted space, compact antennas having strong isola- tion are preferred for MIMO transmission. The effect of MC (mutual coupling) upon MIMO antennas has been studied in [1]. Many methods for decreasing mutual coup- ling for MIMO antennas were calculated in [2-4]. Researchers looked at a number of MC reduction procedures in order to attain the best MC. Some of the most common and widely utilized MC techniques are listed he