A dielectric resonator-based filtering array antenna along with multi input - multi output (MIMO) characteristics is represented in this paper. Two rectangular dielectric resonators, together with a filtering power splitter (PS) is used to get a high gain filtering response. The PS, which consists of a simple T-junction 3-dB power splitters and two pairs of band-rejection resonators, provides four transmission zeros outside the passband. Detail study with an equivalent circuit is presented to understand the working principle of the filtering PS. By utilizing this PS, a two element DRA array is designed at sub-6 GHz frequency band (3.20 GHz-3.54 GHz) with an average broadside gain of 7.8 dBi in the passband and four radiation dips outside the passband. The proposed filtering DRA array effectively suppresses the out-of-band signal, delivers sharp selectivity at band edges. Finally, coalescing the two-filtering array, a MIMO antenna system is presented here. The filtering array MIMO antenna gives reasonable port isolation of greater than 20 dB throughout the operating band. All the major diversity parameters to establish MIMO characteristics e.g. envelop correlation coefficient (ECC), diversity gain (DG), channel loss capacity (CCL), and total reflection coefficient (TARC) persists within their tolerable ranges.