| 摘要 |
<P>PROBLEM TO BE SOLVED: To simply restrict a wireless tag detected by a loop antenna. <P>SOLUTION: A passage detection system includes fixedly installed loop antennas 6; a communication control device 8 receiving an electrical wave emitted from a wireless tag 20 attached to a user X through the antenna 6; and a dummy wireless tag 10 disposed apart from the antennas 6 to emit an electrical wave, wherein the control device 8 detects the wireless tag 20 which emits an electrical wave with reception signal intensity E exceeding reception signal intensity Eth1, Eth2 of electrical waves emitted from the wireless tags 10. <P>COPYRIGHT: (C)2009,JPO&INPIT |
