For an 802.11n network to run at its maximum speed, Wireless N routers and network adapters must be linked and running in a channel bonding mode.

802.11n and Channel Bonding

Bonding utilizes two adjacent Wi-Fi channels at the same time to double the bandwidth of the wireless link compared to 802.11b/g. 802.11n standard specifies 300 Mbps theoretical bandwidth is available when using channel bonding. Because without it, about 50% of this bandwidth is lost, and 802.11n equipment will generally report connections in the 130-150 Mbps rated range in those cases.
Channel bonding substantially increases the risk of interfering with nearby Wi-Fi networks due to the increased spectrum and it power consumption. - See more at: http://trendymediablog.com/2014/09/how-can-i-get-300-mbps-speed-on-my-802-11n-network/