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Wireless communication systems have become increasingly important in recent decades. Antennas are crucial components of these systems, acting as transducers that serve as the system's eyes and ears. Multiple Input Multiple Output (MIMO) antennas are now widely used in mobile handsets to reduce channel fading and optimize channel capacities. This research paper presents a MIMO antenna design for 5G C-band mobile handsets. The suggested design is characterized by its straightforward and uncomplicated construction. Our eight-element antenna array resonates at 3.7 GHz, providing a potential bandwidth of 400 MHz Each antenna element has a slot-dipole shape, which provides a spherical radiation pattern. Our design incorporates a Defected Ground Structure (DGS) and a dual-polarized structure, significantly reducing mutual coupling, resulting in an isolation value Sij ≤ -18 dB between ports. We manufacture the proposed design structure and measure the parameters of the reflection coefficient (CC). The system offers a significant radiation efficiency of 71%. Moreover, we analyzed the Envelope Correlation Coefficient (ECC < 0.03) and Diversity Gain (DG ≤ 9.9 dB) to demonstrate the MIMO performance of the antenna. We also studied how the system performance is affected during talk mode by the presence of the human head. Our proposed design has dimensions of (140 x 70 x 1.6) mm³ and is compared to previous literature studies. Furthermore, it is placed on an FR-4 substrate with a dielectric constant 4.3. The process of simulating is executed using CSTMW Studio. [ABSTRACT FROM AUTHOR]