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A hexagon-shaped fractal ultra-wideband (UWB) Multiple Input Multiple Output (MIMO) antenna is proposed in this paper for S (2 GHz to 4 GHz) and C (4 GHz to 8 GHz) band applications. The proposed design consists of two microstrip fed radiating elements of dimension 82 × 44 × 1.6 mm 3 . One rectangular stub and four resistance loaded stubs are introduced in the ground plane to reduce the mutual coupling between the radiators. These decoupling structures reduce the notches and enhance the isolation from −5 dB to −20 dB for the entire frequency range from 2.3 to 7.4 GHz. The performance characteristics and diversity parameters are also investigated which show the values of ECC < 0.004, DG > 9.96, CCL < 0.4, and MEG < 3 dB, and it is concluded that the proposed design is a good candidate for UWB MIMO antenna. The proposed design is fabricated and tested which shows the close agreement between the simulated and measured results.