<p>The paper on the design and performance analysis of a dolphin-shaped innovative MIMO antenna system was shown in this article to meet the needs of modern wireless systems. The techniques of a low-profile configuration, CPW feeding and compact size were utilised that gather several unit cell antennas, each with improved properties to optimise the entire system’s performance. The MIMO antenna system provides the whole size of 21 × 36 mm² with a wide bandwidth, which operates well over the frequency range of 1.97–14.38&#xa0;GHz, ensuring a significant increase in system speed. The designed antenna shape has some unusual design features, one of which is the isolation technique that pertains to the novel feeding mechanism; these were used to improve the diversity metrics and reduce mutual coupling. The key performance indicators were found that it could handle low channel capacity loss of about 0.3 bits/s/Hz, its envelope correlation coefficient is less than the order of 0.003, the diversity gain is 9.98&#xa0;dB, and the radiation patterns are stable. These key performance results have proved that the designed antenna, due to its zero mean effective gain, can fulfil MEG ≤ 0.5 for mean effective gain and has the potential to be used in wireless communication systems. The MIMO antenna will work at its best performance with a maximum gain of 5.98 dBi and an operating efficiency of over 90%, which is assigned to the structure of the system; thus, it is a very attractive alternative for next-generation communication technologies.</p>