A method of operating a data carrier and data carrier with an antenna structure

The invention describes a portable data carrier, in particular Micro SD card, with a carrier (100), a first and a second antenna (20, 10) and coupled to said first and second antenna (12, 10) processing unit. The data carrier according to the invention is characterized in that on the processing unit by means of the first antenna (20) a field is generated, which causes at a sending communication of the data carrier with a reading device a modulation of a reading device field, wherein for generating the field by the processing unit, a frequency processable of the reader. the frequency of the reading device field is evaluating by the processing unit via the second antenna (10). Further, the first and the second antenna (20, 10) are arranged to each other such that the second antenna (10) (20) is not or minimally from the first transmitting antenna affected.