System and method for reading multiple RF-ID transponders
First Claim
1. A method of communicating between an identification reader and a transponder unit, said method comprising the steps of:
- transmitting a first interrogation signal from said reader, said first interrogation signal having a first read range;
receiving a first response signal at said reader;
transmitting a second interrogation signal from said reader, said second interrogation signal having a second read range which is different than said first read range;
receiving a second response signal at said reader; and
comparing said first response signal to said second response signal to determine a correct response signal.
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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.
264 Citations
22 Claims
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1. A method of communicating between an identification reader and a transponder unit, said method comprising the steps of:
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transmitting a first interrogation signal from said reader, said first interrogation signal having a first read range; receiving a first response signal at said reader; transmitting a second interrogation signal from said reader, said second interrogation signal having a second read range which is different than said first read range; receiving a second response signal at said reader; and comparing said first response signal to said second response signal to determine a correct response signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for identifying each object within a plurality of objects, said method comprising:
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providing a plurality of transponders; associating one of said transponders with each object such that each of said transponders is disposed near one of said objects; directing a first interrogation signal toward at least two of said plurality of objects, said first interrogation signal having a first read range; transmitting a first response signal from at least one of said transponders in response to said first interrogation signal; receiving said first response signal at a reader; transmitting a second interrogation signal from said reader, said second interrogation signal having a second read range which is different than said first read range; directing a second interrogation signal toward at least two of said plurality of objects, said second interrogation signal having a second read range; transmitting a second response signal from at least one transponders in response to said second interrogation signal; receiving said second response signal at said reader; and comparing said first response signal to said second response signal to determine a correct response signal. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification