Patent ID: 8912891

Claim:
A system having at least one RFID chip ( 30 ) belonging to a packaging unit ( 1 ) and being surrounded by a metal outer casing ( 11 ) of the packaging unit ( 1 ), said chip comprising a switching circuit ( 32 ) and an antenna structure ( 31 ), and a transmitting/receiving unit ( 41 ) for transmitting a transmission signal ( 42 ) and/or receiving a response signal ( 43 ) from the RFID chip ( 30 ), an evaluating unit ( 44 ) connected to the transmitting/receiving unit ( 41 ) which can evaluate the response signal ( 43 ), wherein the RFID chip ( 30 ) has an operating frequency which is in a frequency band ( 50 ) below a range of a blocking frequency ( 54 ) which is determined by the conductivity of the metal outer casing ( 11 ) and its thickness and wherein the RFID chip ( 30 ) has a sensor which influences the response signal ( 43 ) of the RFID chip ( 30 ), the sensor responding to condition inside the metallic outer casing and the out sent response signal corresponding to the condition.