If all other devices are working fine, it points to a problem is most likely with the tablet. But you should confirm that by using another router with your tablet.

The problem could be on the physical or driver layer. Is it still under warranty? If yes, the best to do is to open a case. If not, reflashing the firmware would confirm if the problem is hard or soft.

Lots of info (and help) section here:

http://forum.xda-developers.com/foru...23654285710380