| 摘要 |
PROBLEM TO BE SOLVED: To provide a loop antenna which can easily adjust both impedance matching with external circuits and resonant frequencies while maintaining the whole antenna in a small size. SOLUTION: In the loop antenna in this invention, a matching circuit is integrated with a radiation unit. In the matching circuit, an extension extends from one side of a loop of the radiation unit toward the inside, and a bend is bent at the tip of the extension. The one side of the loop of the radiation unit is cut into two in the middle. One end is a feeding point and the other is a short circuit. At the extension, a pair of extension lines extend from the other side of the loop opposite to the feeding point and the short circuit preferably. The bend includes a pair of meandering lines preferably. Each meandering line is bent vertically and zigzag in the direction of the length of the extended line at each tip of the extended line. The pair of meandering lines are connected mutually at the tips preferably. COPYRIGHT: (C)2008,JPO&INPIT
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