A wireless system includes a first antenna configured to form at least part of the shape of a first ring, a second antenna configured to form at least part of the shape of a second ring, where the second antenna is capable of being coupled to the first antenna by an electromagnetic field, a first rotation control unit configured to rotate at least one of the first antenna and the second antenna about a first axis that passes through the substantial center of the first ring, and a second rotation control unit configured to rotate at least one of the first antenna and the second antenna about a second axis that passes through the substantial center of the second ring and that is substantially orthogonal to the first axis.