Are there suppliers of passive tags that are always active until turned off via a switch that detunes the antenna? This action should be reversible.
There are a number of tags that can be deactivated and then turned back on again. The Utah Department of Transportation‘s Express Pass tag contains an EPC Gen 2 RFID inlay that can be switched on or off (see RFID Puts Salt Lake City Drivers in the Fast Lane). Shenzhen Hyan Microelectronics offers a passive EPC Gen 2 tag consisting of a button that is sewn onto a garment and a removable antenna that slides onto that button and extends its short read range to that of a standard UHF tag (see Shenzhen Hyan Microelectronics Creates Privacy-Protecting Garment Label). And Silicon Craft Technology offers passive Near Field Communication (NFC) chips that can be combined with push buttons (see Thai IC Developer’s NFC RFID Chip Has Ability to Enable New Interactive Products).
Another option would be tags made with Impinj’s Monza 4 QT chip (see Impinj Launches New High-Performance RFID Chips). The QT technology enables a tag owner to selectively switch the tag into a short-range mode that makes private profile data accessible only at a very short range. Confidex and Smartrac are two of the companies that have offered tags made with the Monza 4 QT chip.
—Mark Roberti, Founder and Editor, RFID Journal
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