RFID Antenna for Position Detection of Train

摘要

The performance of radio-frequency identification (RFID) must be tested in a fast-moving environment so as to be applied to a high-speed train. A RFID reader antenna design for identification of a high-speed tag is proposed. In order to identify a high-speed tag, the beam pattern of the reader antenna is widened in the direction of the moving tag. The widened beam pattern lengthens the identification range for the fixed backscattering time from the tag. A 2x1 array antenna is used as the reader antenna, and the identification of the RFID tag was measured at different speeds. The identification range was increased 1.4 times by using an angled antenna array. This study tested the detection performance of RFID in a high-speed environment. As a result, we confirmed that a RFID interrogator equipped with our proposed antenna can detect a RFID tag at a speed of 420km/h. In order to verify the applicability of this design to a railroad, running tests were performed in the K-AGT (Korean Automated Guideway Transit) test line. We analyze the RFID response characteristics in a concrete surface environment and present the test results.