802.11ad Wi-Fi: How 60GHz wireless works—and should you use it?
When it comes to Wi-Fi, all of its frequencies fall into the microwave category that spans 300MHz up to 300GHz, with wavelengths of around 1 metre to 1 millimetre respectively. The 2.4GHz of older Wi-Fi standards a/b/g is low enough that it has good penetrative power, and can quite happily pass through people, doors, and walls. The move to the 5GHz frequency for 802.11n/ac did actually reduce the useable range, which is why many routers support both 2.4GHz and 5GHz networks (as well as for backwards compatibility), but on the whole 5GHz remains largely useable throughout small homes. With 802.11ad, though, the signals can’t even penetrate a single brick wall, and are greatly impacted by a simple wooden door. As a result, while 802.11ad provides very fast speeds if you’re in the same room as your router, step outside that room—or even out of line of sight of the router—and you lose signal. – Edward Chester, Ars Technica http://trib.al/MOO1NqR