does exactly that, it takes two existing 802.11 channels and groups them together to form a single channel, with twice the bandwidth. Two times the bandwidth is essentially equal to two times the throughput, so this is another significant feature in 11n.

In the 5GHz band, the channels that are bonded together are adjacent channels, for example channels 36 and 40 in the U.S. In the 2.4GHz range, where the channels are closer together, the bonded channels are spaced several channels apart, so when channel bonding is used in the 2.4GHz band, a significant portion of the available 2.4GHz spectrum is used to service the one bonded channel.

Channel bonding is already widely used. Though effective in both frequency ranges, its use is sometimes not recommended in the 2.4GHz band because it uses so much of the existing spectrum and can cause interference with neighboring 802.11b/g infrastructures. To be safe, reserve the use of channel bonding to the 5GHz channels.