Patent ID: 7049934

Claim:
A data carrier for contactless communication with a communication station, the data carrier comprising the means listed below: reception means for receiving an interrogation signal, which interrogation signal can be generated by a communication station and can be transmitted to the data carrier in a contactless manner by a field produced by the communication station and acting on the data carrier, and generating means for generating a response signal upon reception of the interrogation signal, and processing means for processing the response signal, said processing means being designed to process the response signal into a transmission signal suitable for transmission to the communication station, which transmission signal is recurrently transmitted to the communication station with a specific repetition frequency, and determination means for calculating at least one representative value, the representative value representing the field strength of the field acting on the data carrier, and control connection means between the determination means and the generating means and/or the processing means, said control connection means being designed to controllably influence the generating means and/or the processing means as a function of the at least one representative value, to vary, as a function of the at least one representative value, the repetition frequency with which the transmission signal is transmitted to the communication station.