Method for identifying a plurality of transponders located in a space by a reader having several antennae
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United States of America Patent
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Issued Date -
Jul 27, 2006
app pub date -
Sep 26, 2003
filing date -
Oct 2, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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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.
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