An RFID tag reader for transmitting a read signal, a method for setting a read signal frequency, and methods for providing compare transfer functions

摘要

An apparatus for inductively or capacitively transmitting a supply signal having a supply signal frequency comprises a determining means configured to determine a transfer function describing a relationship between a first electrical signal and a second electrical signal of the apparatus for a plurality of supply signal frequencies , The apparatus further comprises comparing means arranged to compare the transfer function with a plurality of comparison transfer functions and to obtain a comparison result indicating a deviation between the determined transfer function and the comparison transfer functions. A selection device of the device is configured to select a selection function from the plurality of comparison transmission functions based on the comparison result, the selection function having a minimum deviation from the transmission function within a tolerance range, and wherein the selection device is further configured to select a selection frequency the transfer function assigned to the selection function has a maximum value within a tolerance range. The apparatus includes adjustment means configured to adjust the supply signal frequency based on the selection frequency.