Patent ID: 6830193
Filing Date: 2004-12-14
Classification: G06K

Abstract:
A non-contact IC card comprising:an information storage unit for storing information; a communication controller for controlling communication with an external device; a loop antenna including a plurality of loop coils having different loop areas for transmitting and receiving a radio wave to and from the external device; and a changeover switch for changing a communication distance between n the external device and the card by selecting one of said plurality of loop coils, wherein the loop coils of the loop antenna include respective fixed conductors, each of which is fixed to a body of the card and shaped to include a gap at a loop part, and a movable conductor which moves with the changeover switch and is removable from the gap of the fixed conductor, and when the changeover switch is inserted in the gap of the fixed conductor of one of the loop coils, the movable conductor is coupled to the corresponding fixed conductor.