MIMO antennas mean multiple-input multiple-output antennas. Typically used with IEEE 802.11n, and can be used with other 802.11 technologies also. MIMO technologies can be broadly divided into two categories: transmit/receive diversity and spatial multiplexing. MIMO antennas are sometimes called spatially diverse because they use multiple spatial channels to transmit and receive data. MIMO technology can be used to increase the channel capacity. MIMO is not a new technology, but it can play a vital role in 5G.