RFID works by being activated via a RF field, then the data can be transferred to a RFID reader. The RF field/area isn't something that be a whole city, it's going to a be a small defined space. Sorry, you won't be tracking your kids with this technology just yet. Right now shipping companies use this to relay pallet information to their customers, they simply pull a pallet through a RFID frame which captures the pallet contents and relays the info. Walmart, as of a couple of years ago, is requiring their top 200 vendors to RFID tag each carton coming to them - which isn't exactly cheap!
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RFID works by being activated via a RF field, then the data can be transferred to a RFID reader. The RF field/area isn't something that be a whole city, it's going to a be a small defined space. Sorry, you won't be tracking your kids with this technology just yet. Right now shipping companies use this to relay pallet information to their customers, they simply pull a pallet through a RFID frame which captures the pallet contents and relays the info. Walmart, as of a couple of years ago, is requiring their top 200 vendors to RFID tag each carton coming to them - which isn't exactly cheap!