Mutual coupling reduction of a very compact UWB-MIMO linearly tapered slot antenna using a simple stepped slot

A very compact ultra-wideband (UWB) multiple-input-multiple-output (MIMO) ground linearly tapered slot Antenna (LTSA) is presented in this paper. On a cost-effective FR4 substrate, it consists of a ground plane and two microstrip feed lines. Its overall dimension is only 22×26 mm2. To miniaturize, two linearly tapered slots on the ground plane, acts as the main radiator. Then it does not need extra large radiation patch. In particular, a simple embedded three-level stepped slot on the central ground, brings high isolation in the whole UWB band. In addition, two rectangular slots cut in the feed lines widen the impedance bandwidth. Simulated and measured results verify S11<−10dB and S12<−18dB at 3.1 GHz −12 GHz and good diversity performance. Therefore, the proposed MIMO antenna is potential for portable devices applications.

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