Rfid tag, system, and method for tamper detection

An RFID system comprising:

• an article comprising a first article part and a second article part movable relative to the first article part;
• and
• an RFID tag comprising
• a chip storing data representing a predefined reading range, and
• an antenna comprising a first antenna segment and a second antenna segment operatively attached to the first antenna segment so as to form a circuit with the first antenna segment, the second antenna segment configured to detach from the first antenna segment, the antenna having an initial state in which the first antenna segment is attached to the second antenna segment and a modified state in which the first antenna segment is detached from the second antenna segment, the antenna configured to transmit the data representing the predefined reading range from the chip when the antenna is at the initial state and the modified state to enable determination whether an actual reading range of the chip is greater than or less than the predefined reading range, the actual reading range being less than the predefined reading range indicating the modified state, the actual reading range being not less than the predefined reading range indicating the initial state,
• wherein the first antenna segment is disposed over and secured to the first article part, and the second antenna segment is disposed over and secured to the second article part such that, with movement of the second article part relative to the first article part, the second antenna segment moves with the second article part and detaches from the first antenna segment.

An RFID reading method comprising:

• obtaining data from an RFID tag by using an RFID reader, the data representing a predefined reading range and being obtained by the RFID reader at an actual reading range, the RFID tag comprising a chip and an antenna, the chip storing the data, the antenna comprising a first antenna segment and a second antenna segment operatively attached to the first antenna segment so as to form a circuit with the first antenna segment, the second antenna segment configured to detach from the first antenna segment, the antenna having an initial state in which the first antenna segment is attached to the second antenna segment and a modified state in which the first antenna segment is detached from the second antenna segment;
• and
• using the obtained data to determine whether the actual reading range is less than the predefined reading range;
• and
• performing a determination step comprising either determining that the antenna is at the modified state when the actual reading range is determined to be less than the predefined reading range, or determining that the antenna is at the initial state when the actual reading range is determined to be not less than the predefined reading range.