An advanced RFID system to avoid collision of RFID reader, using channel holder and dual sensitivities

Recently, RFID system has become popular and has been growing rapidly. Due to using many readers in limited area, RFID reader collision problem occurs when the reader is interfered with the signals from neighbor readers or other devices. Even if 50 channels are available in North America, 15 channels in Europe and 25 channels in Korea are available. Moreover, in the future, if many mobile (cellular) RFID readers might be used in limited area simultaneously, the number of channels is not enough, and the collision problem might be more serious. Therefore, this paper proposes an advanced RFID system with a channel holder and dual reader sensitivities/reduced reader output power. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2643–2647, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22808

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