Answer Description
Using "channel bonding" the 802.11n wireless standard is capable of operating on two separate channels at the same time. This feature allows 802.11n networks to double their bandwidth, however it can result in increases interference and power usage.
Wikipedia
IEEE 80211n-2009, commonly shortened to 80211n, is a wireless-networking standard that uses multiple antennas to increase data rates The Wi-Fi Alliance has also retroactively labelled the technology for the standard as Wi-Fi 4 It standardized support for multiple-input multiple-output, frame aggregation, and security improvements, among other features, and can be used in the 24 GHz or 5 GHz frequency bands As the first Wi-Fi standard that introduced MIMO (Multiple-Input and Multiple-Output) support, sometimes devices/systems that support 80211n standard (or draft version of the standard) are being referred to as MIMO (Wi-Fi products), especially before the introduction of the next generation standard
IEEE_802.11n-2009 - Wikipedia, the free encyclopedia