Patent ID: 8638268

Claim:
A coil antenna comprising a magnetic-material core and a coil conductor adjacent the magnetic-material core, wherein the coil conductor comprises a plurality of turns of coil conductor pattern, each said turn having a plurality of opposing parallel-to-axis parts that are parallel to a standard axis and a plurality of opposing orthogonal-to-axis parts that are orthogonal to the plurality of parallel-to-axis parts, when viewed in planer view, the magnetic-material core is arranged so as to overlap with at least a part of the orthogonal-to-axis part, a pitch of the plurality of parallel-to-axis parts is shorter than a pitch of the plurality of orthogonal-to-axis parts, a width of each orthogonal-to-axis part is greater than a width of each parallel-to-axis part, and the direction of the standard axis is a direction of the main magnetic flux generated in the magnetic-material core by a current flowing in the coil conductor.