System and method for reading multiple RF-ID transponders
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United States of America Patent
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Mar 19, 1996
Grant Date -
N/A
app pub date -
Jun 24, 1994
filing date -
Jun 24, 1994
priority date (Note) -
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Abstract
A system and method for communicating between an identification reader 12 and a transponder unit 10 is disclosed herein. A first interrogation signal is transmitted from the reader 12. This first interrogation signal having a first read range. A first response signal is then received at the reader 12 after which a second interrogation signal is transmitted from the reader 12. The second interrogation signal has a second read range which is different than said first read range. The read range can be varied by varying either the amplitude or duration of the power level of the interrogation signal. A second response signal is then received at the reader 12. These consecutive responses are then compared determine a correct response signal which can be displayed.
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