A technique for controlling the bandwidth of the multi–input–multi–output (MIMO) dielectric resonator antenna (DRA) is implemented in this paper. Firstly, a simple two ports aperture coupled rectangular DRA for providing the triple-band response is designed. The rectangular slots of size around quarter wavelength are inserted in the ground plane and the substrate. The modes generated in the antenna are merged and the triple-band responses are converted to wide dual-band response. Furthermore, the dual-band response can be converted to single band by changing the aspect ratio of the DR and other physical and electrical parameters. The implemented technique for controlling the impedance bandwidth of the two-port MIMO DRA is studied with the parallel and orthogonal feeding and verified with its significant impact. This technique can be applied for designing MIMO DRA to be operated in wireless systems