A novel two-dimensional MIMO array topology for UWB near-field high-resolution imaging

In this paper, according to the two design principles of uniform distribution and less element shadowing for effective aperture, a novel two-dimensional (2-D) sparse ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna array topology is proposed for near-field high-resolution imaging. Compared with another different array having the same number of transceivers, the proposed optimal array has a better control over the sidelobe level (SL) both in the interference region (IR) and non-interference region (NIR) of the simulated radiation patterns, from which the peak sidelobe levels (PSLs) of the optimal array obtained are lower than the compared one. Experimental imaging results for a mannequin target also verify the outstanding imaging capability of the proposed array. Therefore, the proposed array topology has potential applications for high-quality UWB near-field imaging.