| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio tag antenna the characteristic of which is broadbanded to enhance the performance, and to provide a management system for articles using the same. <P>SOLUTION: The radio tag antenna for making communication with a radio tag provided with a plurality of input ports forms its antenna pattern by shifting frequencies at which a return loss value of the antenna is a minimum. <P>COPYRIGHT: (C)2008,JPO&INPIT |
