Free running RF identification system with increasing average in

Details Free running RF identification system with increasing average in Free running RF identification system with increasing average in

1999-02-25

2000-11-28

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340 102, 340 1032, G08B 1314

Patent

active

061541362

ABSTRACT:
An RF electronic identification system 10 is disclosed and claimed. The system includes a reader 12 and a plurality of transponders 14.1 to 14.n. When energized by an interrogation signal from the reader, each transponder automatically responds by repeatedly retransmitting a signal burst including identification code data associated with the relevant transponder. Each transponder includes circuitry 34 for generating random inter-transmission intervals for separating any two consecutive signal bursts and a controller 42 for the generation circuitry, to cause an average value of the inter-transmission intervals over a period of time to vary, preferably to increase. This feature enhances the probability and speed of reading a transponder population of almost any size.

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