Patent ID: 8248204
Filing Date: 2012-08-21
Classification: G01V,G06K

Abstract:
1. A tag detecting system comprising: a first generator emitting a pulse code modulated signal of a predetermined intensity through a first antenna; a second generator emitting a pulse code modulated signal of a predetermined intensity through a second antenna; an RFID tag detecting the pulse code modulated signal from the first antenna and the second antenna, and transmitting a discrimination signal by responding to the pulse code modulated signal; and a receiver receiving the discrimination signal through a receiving antenna, wherein the first antenna and the second antenna are adjacently arranged to produce a cross over area between high-frequency magnetic fields formed by both the first and second antennas, each of the first generator and the second generator emits the pulse code modulated signal at such a timing that spaces included in a predetermined part of the pulse code modulated signal emitted by any one of the first and second generators is occupied by the pulse code modulated signal emitted by the other the first and second generators, and the RFID tag is made not to detect the pulse code modulated signals due to the spaces being occupied, if the RFID tag is located in the cross over area or a part of the cross over area.