Patent ID: 6946952

Claim:
A data carrier ( 1 ) for contactless communication with a communication station, the data carrier ( 1 ) comprising the means listed below: reception means ( 3 ) for receiving an interrogation signal (IS), which interrogation signal (IS) can be generated by a communication station and can be transmitted to the data carrier ( 1 ) in a contactless manner by a field produced by the communication station and acting on the data carrier ( 1 ), and generating means ( 17 ) for generating a response signal (RS) upon reception of the interrogation signal (IS) and processing means ( 18 ) for processing the response signal (RS), the processing means ( 18 ) being designed to process the response signal (RS) into a transmission signal (MCRS; MCRS 1 , MCRS 2 , MCRS 3 ; MCRS 4 , MCRS 5 ) suitable for transmission to the communication station, in which processing means ( 18 ) at least one transmission parameter of the transmission signal (MCRS, MCRS 1 , MCRS 2 , MCRS 3 ; MCRS 4 , MCRS 5 ) can be varied, and determination means ( 22 ) for determinating at least one representative value (REP 1 , REP 2 ), the representative value (REP 1 , REP 2 ) representing the field strength of the field acting on the data carrier ( 1 ), and control connection means ( 25 ) between the determination means ( 22 ) and the processing means ( 18 ), the control connection means ( 25 ) being designed to controllably influence the processing means ( 18 ) as a function of the at least one representative value (REP 1 , REP 2 ), used to vary at least one transmission parameter of the transmission signal (MCRS; MCRS 1 , MCRS 2 , MCRS 3 ; MCRS 4 , MCRS 5 ) as a function of the at least one representative value (REP 1 , REP 2 ).