Disney theme park customers have special RFID bands, called MagicBand, helping them use the parks. A 13-month old Wired article called this a $1B bet on their MagicBands, but such an expenditure would have been more on the back end, rather than on the bands themselves.
At the time, Disney was quite forthcoming with tech details, photos and teardowns about the RFID bands. EETimes has a video,
At one level the MagicBands operated as 2.4GHz devices, but they also had a longer-range low-frequency capability they didn't discuss. This was explored by the fellow at AtDisneyAgain. See
Their design has recently dramatically changed, which is obvious by comparing this photo I took, see dropbox, to the earlier teardowns.
I wasn't able to identify the new 32-pin primary RFID controller IC. But note the coupling components and the 1/4 turn 2.4GHz antenna.
I also wasn't able to identify the large RF driver-IC / module connected to the outer five-turn low-frequency antenna loop (outer diameter 0.85 x 1.0 inches). Nor could I find any information about the low-frequency system, except that it could work at longer ranges.
Perhaps somebody here can help.