Method for selecting and writing into RFID-transponders
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United States of America Patent
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Oct 28, 2003
Grant Date -
N/A
app pub date -
Feb 25, 2002
filing date -
Oct 18, 1999
priority date (Note) -
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Abstract
Method and system for reading out and writing to RFID-transponders with inductive coupling including a read/write unit with a transmission frequency f.sub.s1 defined as a basic transmission frequency and a plurality of transponders operated at a resonance frequency f.sub.R. The resonance frequency f.sub.R is fixedly predetermined, then for operating conditions with a high distance range, the resonance frequency f.sub.R equal to the basic transmission frequency f.sub.s1 is selected. For operating conditions with a high recognition rate with a plurality of transponders located within a detection field, the basic transmission frequency f.sub.s1 is reduced to a fixed alternative value f.sub.s2 . This procedure guarantees reliable communication between the transponders and the read/write unit.
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