Single-band 802.11bgn Wi-Fi routers are available. This indicates they're only compatible with the 2.4 GHz spectrum. Wi-Fi 802.11g combines the greatest features of both 802.11a and 802.11b wireless networks. 802.11g uses the 2.4 GHz frequency for improved range and has a capacity of up to 54 Mbps. Backward compatibility exists between 802.11g and 802.11b.