Method for resolving signal collisions between multiple RFID tra

Details Method for resolving signal collisions between multiple RFID tra Method for resolving signal collisions between multiple RFID tra

1997-09-03

1999-11-16

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 34082531, 714797, 714799, 714748, 714749, H04B 700

Patent

active

059865709

ABSTRACT:
Communications between an RFID interrogator and an RFID transponder require that no more than one transponder be present in the reading range of the interrogator and transmitting into motion at any given time. If multiple transponders are in the field, then a collision between the return signals of the transponders occurs, rendering the signals unreadable. A method to resolve the collisions and allow for accurate transmission of each transponder's data is given. This method is especially effective over other methods when the transponder is a read-only type of device, whereby there is no communications interrogator on board the read-only transponder.

REFERENCES:
patent: 5339073 (1994-08-01), Dodd et al.
patent: 5583819 (1996-12-01), Roesner et al.
patent: 5742618 (1998-04-01), Lowe
patent: 5745049 (1998-04-01), Akiyama et al.
patent: 5751570 (1998-05-01), Stobbe et al.
patent: 5802080 (1998-09-01), Westby

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