Question: can 802.11 bgn connect to 5ghz?
Answer: Generally, a router that states it's 802.11a/g/n, or 802.11ac will work at 5GHz. However, a router that is 802.11b/g/n has a slim chance of supporting that frequency, and you may need to upgrade. If your router supports 5GHz connectivity, the next thing to do is to check your adapter.