NONCONTACT IC CARD

摘要

An electronic device for suppressing a decrease in reception sensitivity and a signal distortion in the case of using IC cards in a stack. A loop antenna (1) provided in an IC card is wound in four turns, where one turn is constituted of, for example, a linear section (L2), a curve section (L3), a linear section (L4), and a curve section (L5). When two loop antennas (1) of such a shape are superposed inversely to each other, corners are not superposed. For example, a corner comprising the curve section (L3) and the linear section (L4) of the loop antenna (1) is superposed on the curve section (L3) of the inversely superposed loop antenna (1), so that the corner is not superposed with a small number of superposed sections as the whole. This invention is applicable to an IC card for the noncontact transfer of data.