Patent ID: 8798556

Claim:
A card device capable of being inserted into a card slot in a housing of an electronic apparatus, the card device comprising a coupler for transmitting and receiving an electromagnetic wave by electromagnetic coupling between the coupler and another coupler, the coupler being configured to be used for close proximity wireless transfer, the coupler comprising: a line-shaped coupling element comprising a first open end and a second open end, wherein each of the first open end and the second open end is not connected to any conductive member; a ground plane; a feeding element connecting the coupling element and a feed point, the feeding element comprising a first end connected to an intermediate point of the coupling element between the first open end and the second open end, wherein a length between the intermediate point and the first open end is equal to a length between the intermediate point and the second open end, and a second end connected to the feed point; and a first short circuiting element connecting the feeding element and the ground plane, the first short circuiting element comprising a third end between the first end and the second end of the feeding element, and a fourth end connected to a short circuiting point on the ground plane wherein a shape of the coupling element is symmetric with respect to the intermediate point of the coupling element, wherein the card device is capable of being removably inserted into the card slot from outside the housing, the card slot having an opening on the housing, the card slot being based on a specific general purpose card standard, wherein the card device comprises one end at which a connector configured to interface with the electronic apparatus is arranged and another end, and wherein the coupling element is positioned on a side of other end of the card device such that the coupling element is positioned on a side of the opening of the card slot when the card device is inserted into the card slot.