Abstract

A compact ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna, with low mutual coupling, is proposed for UWB MIMO applications. Two coplanar annular monopole planar UWB antennas are placed side by side on the substrate with a dielectric constant of 4.4 and a size of 40 mm $\times 80$ mm $\times 1.6$ mm. In order to reduce the mutual coupling between the two elements, the expanded ground is exploited. The proposed antenna achieves a good impedance matching with $S_{11}\lt -10$ dB and a low mutual coupling with $S_{12} \lt -20$ dB over the entire UWB band.

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