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A novel compact and planar MIMO antenna array with polarisation diversity is proposed on a single layer. The proposed array is composed of two orthogonal polarised elements which act as electric and magnetic loop antennas. A high isolation of 20 dB between the two antennas is achieved at 2.3 GHz. The overall size of the array is 38 × 28 mm (i.e. 0.291 × 0.214 λ0). The calculated envelope correlation coefficient is 0.00035.