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Tags, Readers Compliant With the ISO 18000-3M3 Standard Expected SoonWith the new standard, RFID interrogators will be able to read a greater quantity of high-frequency passive tags simultaneously, and much more quickly, compared with most HF systems currently available.
The end-user companies testing 3M3 RFID technology are using tags for tracking poker chips or gaming cards within the casino industry, as well as for document tracking. The densely packed RFID tags, Bischof says, would be read too slowly using traditional HF readers (that is, those complying with the ISO 15693 or ISO 14443 standard), but most UHF readers and tags operate in the far field, and thus have a long read range that might create problems as well. However, several RFID vendors provide an EPC Gen 2 UHF tag designed to be interrogated only at close range, such as Avery Dennison's AD-110m5 inlay (see RFID News Roundup: Avery Dennison Intros Ultra-Small RFID Inlay for Item-Level Applications) and Alien Technology's ALN-9613 "SIT" inlay (see Alien Technology Announces New IC, Handheld Readers and Inlays). In addition, some RFID hardware companies, such as Impinj, offer RFID reader antennas designed for near-field (close-range) UHF applications, such as Impinj's Brickyard, Matchbox and Mini-Guardrail antennas (see Impinj Launches Products to Speed Item-Level Encoding).
In some cases, says Victor Vega, NXP's director of RFID solutions, customers request an HF solution for the "controlled and consistent read range" that such a system offers. "UHF offers either near-field or far-field solutions, and HF is limited to near-field only," Vega states. "But when considering the near field of both, it's interesting to note a more consistent and controlled RF field and performance with an HF system versus that of a UHF system. In many applications, that may not matter—but in some, it's critical." According to Bischof, the technology's cost would also be considerably less than that of traditional HF tags and readers.
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