| 摘要 |
<P>PROBLEM TO BE SOLVED: To switch directivity of a small antenna. <P>SOLUTION: A loop-like antenna has a first loop antenna 10 having a first linear part 11 having a first electric power supply/reception end 11a, a second linear part 12 arranged in parallel to and opposite to the first linear part, and a first connection part 13 connecting the other end different from the first power supply/reception end of the first linear part and an end of the second linear part corresponding to the other end in a right-angle direction, and folded by at least one and half reciprocation. The loop-like antenna arranged inside an inner periphery of the first loop antenna on a surface of the first loop antenna has a second loop antenna 20 with a shape similar to that of the first loop antenna. The antenna has a switching device for controlling a condition for supplying/receiving power from one of the first power supply/reception end 11a and a second power supply/reception end 21a of the second loop antenna, and connecting the other power supply/reception end to a line impedance to be switchable between the first power supply/reception end and the second power supply/reception end. <P>COPYRIGHT: (C)2013,JPO&INPIT |
