Patent ID: 7503505

Claim:
A non-contact IC card system comprising: a non-IC card including an electrically insulating body, a first antenna comprising a first plate shape conductor, the first antenna supporting a first frequency band, and an IC device connected to the first antenna for data transmission and reception; and an electrically insulating attaching body including a second antenna comprising a second plate shape conductor, the second antenna supporting a second frequency band, different from the first frequency band, and detachably attached to the IC card, wherein the first antenna and the second antenna are opposed to each other and spaced apart from each other when the attaching body is attached to the IC card so that the first and second antennas are capacitively coupled to each other through parts of at least one of the insulating body of the IC card and the insulating attaching body that are interposed between the first and second plate shape conductors, and when the attaching body is attached to the IC card and the second antenna receives electromagnetic waves, the IC device is driven by the electromagnetic waves through the capacitive coupling of the second antenna to the first antenna.