Transponder for determining a passing time

Abstract

The present invention relates to a transponder (12) for determining a passing time upon passing an RFID loop antenna (18), comprising: three inductive coils (26) for measuring three field strength values of an activation signal transmitted by the RFID loop antenna upon passing the RFID loop antenna; a processing unit (28) for determining an effective value of the three field strength values indicating an inductive field strength based on the three field strength values; an accumulation unit (30) for collecting effective values for multiple activation signals over time and determining a time series of effective values; and a symmetry unit (32) for determining a transponder passing time corresponding to a point in time (P) within the time series at which effective values before and after the point in time have a maximum level of symmetry. The present invention further relates to a method and a system (14) for determining a passing time of a transponder (12).

Dependencies are inferred from the claim text.