Abstract
This study details the development and testing of a four-element MIMO antenna operating at frequencies below 6 GHz. Initially, a single-element dual band CPW fed antenna is designed working in the range of 3.05 to 3.45 and from 4.1 to 5.15 GHz. With this approach, a Quad-element MIMO structure is designed by arranging them orthogonally adjacent to each other. The performance of this MIMO structure is enhanced by inserting a Frequency Selective Surface (FSS) on the bottom plane. The suggested MIMO antenna delivers wide impedance bandwidth ranging from 2.84 - 5.79 GHz (fractional bandwidth of 68%) with at least 15 dB of isolation for the complete operating band. This MIMO antenna yields good realized gain (>4.9 dBi), optimum radiation efficiency (>59%), and impressive envelope correlation coefficient (<0.05). The structure is appropriate for applications operating in the sub-6 GHz 5 G communication range.
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