In this paper an EBG structure is introduced for coupling reduction between elements in a four-element linear MIMO array of patch antennas operating at 5.8 GHz to obtain proper independent performance for the elements of the array. The EBG structure was first employed between two elements linear MIMO array of patch antennas to assure functionality. Then, it was employed between the elements of the final four-element MIMO array antenna, simulated using a full wave simulation tool (HFSS). The proposed MIMO antenna is characterized by separation 0.5 λ0 between side by side elements. The array
antenna performance was examined, in both cases, using electromagnetic full wave simulation. The final proposed four-element array antenna was simulated, using HFSS for coupling reduction validation. Results confirm that mutual coupling between each two side by side elements has been reduced by 4-13 dB.