Development of nearby cluttered tags detection unit with UHF-RFID technology

Recently, the system for closely-spaced tag management (at 13.56 MHz) and the system for the long distance identification (at 920 MHz) have been carried out to practical use. For continuous logistics, it is desired that those are integrated seamlessly. However, integration into the system, which uses the frequency band of 13.56 MHz, is disadvantageous to keep the feature of the long distance identification. In this paper, the system which identifies nearby cluttered tags by the frequency band for the long distance identification is described.