RFID reader, RFID system, the method for controlling transmission power of an RFID reader and computer program product

摘要

RFID reader - transmission means (110) for generating a field for inductive coupling with an RFID (108) transponder, - measuring means (116) for measuring a field strength of the field, - regulating means (112) for controlling the transmission power based on the measured field strength, means being configured to control so that the transmission means are operated with a first transmission power, so it is a first intensity field, comparing the first field strength with a first threshold value, and that the transmission means are operated with a second transmission power, when the first threshold value is not reached, the second power higher emission than the first transmission power, so that the second resultant field strength due to the second transmission power is greater than the first threshold value, characterized in that the means of re angulation are configured so that the measured field strength is compared to a second threshold value, and that the transmission means are operated with a third transmission power, when the second threshold value is not reached, the third power emission greater than the second emission power.