RFID system has become one of the most useful tools for the management of the library. Using electromagnetic coupling, an RFID tag can get power supply by a reader and communicate with it for data exchange. Because the RFID system enables non-contact communication, various services and applications including the management of a library catalogue are possible. However, because the system is affected easily by neighboring environment, the communication performance is low. In this paper, by using 13.56 MHz RFID system, we evaluate the resonance frequency of RFID tag and the communication distance between the reader and the target tag when some tags becoming as interference sources come close to each other, and show that the adjacent tags near the target tag do not only reduce the performance of RFID system but also expand the communication distance.
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