RFID tag uncoupling one of its antenna ports and methods
US7667589B2 · kind B2 · utility
27Cited by
85References
55Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2004 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Apr 27, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/07749
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
RFID tags have an on-chip antenna and an off-chip antenna. One of the antennas can become uncoupled if the proper signal is received, while the other antenna may still operate. The uncoupled antenna can be the larger one, for example the off-chip antenna. Then the tag can then be read only by the smaller antenna, which effectively reduces the range of the RFID tag, but without disabling it entirely.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.