Help S3 Wifi speed & frequency

[ramsbod]

I have a 150N wireless router using 2.4GHz band. My Samsung S3 will not connect faster than 64Mbps. How can I get it to connect at 150Mbps? I have no other devices connected to the router. Is the speed limited to 64Mbps at 2.4GHz? I can't find anything about this in the specifications of the phone. The specifications say it should be able to connect at 300Mbps. I am running Jelly Bean 4.1.2. My laptop can connect at 150Mbps so it can't be the router.