Radio frequency identification (RFID) tag and a method of operating an RFID tag

A check comprising:

• sheet material;
• and
• a radio frequency identification (RFID) tag embedded in the sheet material during manufacture of the check, the RFID tag including (i) RFID circuitry other than circuitry external to the RFID tag, (ii) an antenna connectable to the RFID circuitry and for receiving an interrogating signal of an interrogating frequency from an interrogating source, and (iii) activatable means for, when activated in response to detecting electromagnetic radiation which is from a source external to the RFID tag and which is of a predetermined frequency which is different from the interrogating frequency of the interrogating signal, disconnecting the RFID circuitry and the antenna from each other to prevent the RFID circuitry from receiving the interrogating signal from the interrogating source so as to disable operation of the RFID tag.

A check comprising:

• sheet material;
• and
• a radio frequency identification (RFID) tag embedded in the sheet material during manufacture of the check, the RFID tag including (i) internal RFID circuitry, (ii) an antenna for receiving an interrogating signal of an interrogating frequency from an interrogating source, and (iii) means responsive to electromagnetic radiation of a predetermined frequency which is different from the interrogating frequency of the interrogating signal and for electrically connecting the RFID circuitry and the antenna to each other to allow the internal RFID circuitry to receive the interrogating signal from the interrogating source so as to enable operation of the RFID tag when electromagnetic radiation of the predetermined frequency which is different from the interrogating frequency of the interrogating signal is detected.

A check comprising:

• sheet material;
• and
• a radio frequency identification (RFID) tag embedded in the sheet material during manufacture of the check, the RFID tag including (i) internal RFID circuitry, (ii) an antenna for receiving an interrogating signal of an interrogating frequency from an interrogating source, and (iii) means responsive to electromagnetic radiation which is from a source external to the RFID tag and which is of a predetermined frequency which is different from the interrogating frequency of the interrogating signal and for electrically disconnecting the RFID circuitry and the antenna from each other to disable operation of the RFID tag when electromagnetic radiation from the source external to the RFID tag and of the predetermined frequency which is different from the interrogating frequency of the interrogating signal is detected.