Where can I purchase such a solution?
AeroScout and Ekahau are the leading providers of active RFID systems that leverage existing Wi-Fi access points. Radianse is another company that offers Wi-Fi-based RFID systems. And San Jose wireless systems company Redpine Signals has developed what it says is the first dual-band real-time location system (RTLS) tag that can transmit at the 2.4 GHz or 5 GHz ISM bands over a Wi-Fi network. The tag receives a transmission from an exciter, known as a WM0 configurator, and then transmits its own identifier, along with that of the configurator, to the nearest Wi-Fi node. The company's dual-band WM1-50 tag can transmit not only at 2.4 GHz, but also at 5 GHz, complying with the IEEE 802.11a Wi-Fi standard. Redpine Signals also offers the WiseMote WM1-20 tag, which transmits only at 2.4 GHz. Both tags are commercially available now (see Redpine Signals Intros Dual-Frequency Wi-Fi RFID Tag).
There are also 802.11 tags that you can buy off the Internet from suppliers of unknown repute in Asia. I would caution you to test any tags you purchase with the same Wi-FI system with which you plan to deploy them. There are issues with how tags initiate handshakes with Wi-Fi networks that can cause issues.
—Mark Roberti, Founder and Editor, RFID Journal
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