In this paper EBG structures including parallel plates of EBGs are being used to reduce the mutual coupling between the two omni-directional antennas. Here, we have chosen the Discone antennas as omni directional antennas and comparisons between uniform and non-uniform structure with conventional array of antenna is presented, and compared with the fractal structure for designing ultra wide band structure. The multi-layer EBG structure have been designed and simulated based on EBG metamaterial characteristics. Our aim is to reduce coupling or reduction of S 21 to have better coupling reduction and shielding effectiveness for applying the structure as an absorber or shield and shielding bandwidth in non uniform structure is increased up to 16 GHz.
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