Method of interrogating a plurality of transponders arranged in the transmission range of an interrogating device and transponders for use in the said method
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United States of America Patent
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Mar 15, 1994
Grant Date -
N/A
app pub date -
Apr 29, 1992
filing date -
Apr 29, 1992
priority date (Note) -
Expired
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Abstract
A single interrogation device interrogates a plurality of transponders arranged within the range of transmission of the interrogation device and identifies them without any mutual interference. The interference free operation is obtained by the interrogation device sequentially transmitting a plurality of RF interrogation pulses, separated from each other in time and whose energy changes from one pulse to the next one, to transponders which have an energy storage element and which respond to the interrogation pulses with an answer signal in dependence upon the condition that, at the end of each interrogation pulse, the charge voltage present at the energy storage element falls within a predetermined voltage range.
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