A wide band MIMO slot antenna for 5G Wi-Fi

The bandwidths of the wireless channels have been extended in IEEE 802.11ac compared to 802.11n and is restricted strictly to the 5 GHz ISM band. It also allows MIMO which makes antenna design challenging especially where the space is restricted. Here a wide band slot antenna in the shape of a modified square with dual ports is proposed. The antenna has two asymmetrical orthogonal micro-strip line feeds. One port covers the 802.11ac band with 13% fractional bandwidth while the other port is matched over a greater 26% fractional bandwidth. The slot is modified with protuberances such that the coupling between the feeds are minimized and the excitation of the modes hence the bandwidth of the feeds are controlled by the protuberances. As a result of this modification the slot size is reduced further by 22% compared to the unaltered square slot design.