Data transmission method and a RFID reader provided with a...

Details Data transmission method and a RFID reader provided with a... Data transmission method and a RFID reader provided with a...

2006-03-13

2010-10-05

Trieu, Van T. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572700, C340S539210

Reexamination Certificate

active

07808389

ABSTRACT:
The present invention relates to a method, a reading device and a system for transmitting data and/or energy between a reading device and a transponder unit. Via a first antenna coil of the reading device generating a first magnetic field data and/or energy are transmitted to the transponder unit. By means of a second antenna coil a second magnetic field with opposite sign is generated. Within a near field or communication range (12) of the reading device the second magnetic field is weaker than the first magnetic field. In a tap-proof range (13), i.e. outside the near field, the two magnetic fields have the same absolute value and cancel each other out due to the opposite signs.

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