802.11n was aproved in 2009 and has since picked up the name Wi-Fi 4 and is the first of the Wi-Fi standards to specify MIMO (Multiple Input, Multiple Output, which is the use of multiple antennas to achieve higher speeds and dodge obstructions and interference) and Wi-Fi 4 is able to go dual-band, meaning both 2.4 GHz and 5.0 GHz are supported.
Frequency | Promoted Speed | Real-World Speed |
2.4 GHz | 300 Mbps | Up to 150 Mbps |
5.0 GHz | 900 Mbps | Up to 450 Mbps |