| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of detecting an identification target in a region (ZO) around an antenna device. <P>SOLUTION: A calibration signal (S_CAL) is transmitted toward the antenna device to determine control power (PR); a function signal (S_FONC) corresponding to the control power (PR) is transmitted toward the antenna device so that the antenna device radiates a prescribed magnetic field; the identification target receives the prescribed magnetic field, measures a magnetic field (Br) corresponding to a radiation magnetic field, compares the magnetic field with a nominal magnetic field (B0); and it is determined whether the identification target is positioned inside the region (ZO) around the antenna device in a form changed according to the comparison result. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
