Method for identifying a plurality of transponders located in a space by a reader having several antennae
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Abstract
The invention concerns a method for identifying a plurality of passive transponders 6 using a reader comprising several antennae whose detection fields do not merge spatially and/or temporally, said transponders comprising an analogue 34 or digital 52 memory for storing binary information for a certain time interval in the absence of any reader feeding fields. For each antenna, the method sequentially implements an anti-collision protocol during which each identified transponder is set in a “silent” mode. The method provides for this information to be stored in said memory of each transponder for a time interval including at least the switching period between a first antenna and a second antenna of the reader. This prevents detection of the same transponders by several antennae, which makes the identification method quicker and more efficient.
71 Citations
14 Claims
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1-7. -7. (canceled)
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8. A method for identifying a plurality of passive transponders located in a detection space of a reader having at least a first antenna (Z) and a second antenna (Y) whose respective transmission-reception fields are not merged spatially and/or temporally, said method implementing an anti-collision protocol for each of the antennae during which each transponder identified by a given antenna is then set in a “
- silent”
mode during the protocol associated with said antenna, wherein in each transponder there is provided a memory arranged to keep its information without the reader field being powered only for a certain period of time, and wherein information is stored in said memory concerning the state of identification of the transponder concerned, in particular the fact of activating the “
silent”
mode, at least at the end of the anti-collision protocol associated with said first antenna, said information being kept by at least the transponders identified by said first antenna at least for an interval of time including the period of switching from the first antenna to said second antenna during which there is no supply field for the transponders. - View Dependent Claims (9, 10, 11, 12, 13, 14)
- silent”
Specification