Patent ID: 7460018

Claim:
An RFID (Radio Frequency IDentification) tag comprising: an RFID chip; a tag antenna connected to said RFID chip; an electromagnetic shield for forming a space including said RFID chip and said tag antenna into an electromagnetically shielded space; and a positional-relationship controller for providing a first positional relationship and a second positional relationship as a relative positional relationship between an inductive antenna device and said RFID tag, said inductive antenna device including an access-device-side antenna capable of being electromagnetically coupled with an antenna of an RFID access device, a tag-side antenna capable of being electromagnetically coupled with said tag antenna and a conductive line for electrically connecting said access-device-side antenna with said tag-side antenna, said first positional relationship making possible electromagnetic coupling between said tag antenna and said tag-side antenna staying in said electromagnetically shielded space with said access-device-side antenna positioning outside said electromagnetically shielded space, said second positional relationship making impossible electromagnetic coupling between said tag antenna and said tag-side antenna.