Two UWB-MIMO antennas with high isolation using sleeve coupled stepped impedance resonators

Two printed ultra wideband (UWB) antennas integrated with stepped impedance resonators for Multiple Input Multiple Output (MIMO) communications applications are proposed in this paper. The proposed MIMO antennas consist of two simple printed microstrip-fed monopole antennas. The high isolations are obtained by using sleeve coupled rectangle stepped impedance resonator (R-SIR) and sleeve coupled roundness stepped impedance resonator (RD-SIR) on the ground plane, respectively. The proposed antennas operate over a wide impedance bandwidth ranging from 3.1GHz to 10GHz. And the antennas have high isolation over 23dB. The return loss and the isolation of the antenna are investigated by means of HFSS. The results show that the proposed UWB-MIMO antennas have high isolation and good impedance match characteristic.