Band-stop Filter Design of Coplanar Stripline

In MIMO system, the effect of mutual coupling between the antennas influences and often deteriorates the transmission capacity of the wireless communications. In this paper, band-stop filters using spur-line and CPS structures between two antennas are proposed to reduced the effect of the coupling. Simulation and measurement show that more than 20dB isolation between antennas has been obtain in a 2.45 GHz MIMO system.