| 摘要 |
PROBLEM TO BE SOLVED: To obtain satisfactory communication sensitivity with an electronic apparatus over an entire or substantially entire range of a loop antenna.SOLUTION: The loop antenna is formed from a plurality of loops, each of the loops being configured by winding a conductor in the same direction, and comprises at least two or more loop areas including an outermost loop area including a loop of an outermost circumference and an innermost loop area including a loop of an innermost circumference. In the loop areas, loops of at least one or more windings are formed. In the two or more loop areas, loops are configured for which a distance between the loop of the innermost circumference in the outermost loop area and the loop of the outermost circumference in a loop area inside of the outermost loop area by one area is less than a predetermined length and a short side or a short diameter of the loop of the innermost circumference in the innermost loop area is less than a predetermined length. The loop antenna is formed from a least number of loop areas from a size of the loop of the outermost circumference in the outermost loop area and satisfying a configuration of the plurality of loops.SELECTED DRAWING: Figure 3 |
