Dual-band wlan multi-antenna system with high isolation

A dual band [2.4-2.48 GHz] and [5.15-5.725 GHz] multi antenna system with high isolation between the access ports is presented in this paper. It is found that isolation of more than -18 dB can be achieved in the two bands between two planar inverted-F antennas (PIFAs) sharing a common ground plane, with inter-antenna spacing of 0.016λ₀ for the lower band. The isolation between the two elements is reduced by the insertion of slots on the ground plane. The proposed system gives good diversity performance results.