5GHz network not being detected

I am using a ASUS ZENBOOK, Modèle : UX21E laptop fitted with the Qualcomm Atheros AR9485WB-EG WIRELESS NETWORK ADAPTER w/Integrated 802.11 b/g/n and I can not see and therefore can not connect to my 5GHz wireless network. How can I get this PC to see the 5GHz network.

My network is fine, Im using a Linksys WRT1900AC dual-band router. With the ASUS I can pick up the 2.4GHz band but not the 5Ghz band which I want. With my other laptop a Thinkpad T400 fitted w/Integrated 802.11 b/g/n I can pick up the 5Ghz band

Fabricant : Qualcomm Atheros Communications Inc.

Description : Qualcomm Atheros AR9485WB-EG Wireless Network Adapter

Version du pilote : 10.0.0.329

Adresse physique : ?E0-B9-A5-D2-B2-36

The netsh wlan show drivers command reports : Types de radios pris en charge : 802.11b 802.11g 802.11n

Please advise on how I can rectify this issue.