RADIO TAG, RADIO TAG POSTURE SENSING DEVICE, AND RADIO TAG POSTURE SENSING SYSTEM

摘要

PPROBLEM TO BE SOLVED: To provide a system automatically sensing the posture of articles provided with radio tags. PSOLUTION: A radio tag posture sensing device 50 comprises a directional antenna 52 transmitting and receiving radio signals between radio tags 20; an interrogator 70 which measures signal strength of radio signal received from radio tag 20 with directional antenna 52; and a sensing part 90 for sensing the posture of the radio tags on the basis of the signal strength measured with the interrogator 70. The radio tags 20 is provided with an antenna 22 having single directivity. By detecting the posture of the directional antenna 22 of the radio tags 20 against the directional antenna 52 of the radio tag posture sensing device 50 on the basis of the signal intensity of the radio signal received from the radio tags 20, the posture of an article 1 provided with a radio tag 20 can be automatically detected. PCOPYRIGHT: (C)2006,JPO&NCIPI