In this contribution, the author examines the feasibility of on-body backscatter radio frequency identification (RFID)\r\nsystems in the ultra high frequency range. Four different on-body RFID systems are investigated operating monopoles\r\nor patch antennas at 900 MHz or 2.45 GHz. The systems� feasibility is analyzed by means of on-body channel\r\nmeasurements in a realistic test environment. The measured channel transfer functions allow to evaluate if enough\r\npower is available for a reliable backscatter communication. This evaluation is done with the aid of outage\r\nprobabilities in the forward link and the backward link of the systems. Using these probabilities, the on-body systems\r\nprove feasible when using state-of-the-art reader and transponder chips. In particular, the use of semi-passive RFID\r\ntransponder chips leads to a reliable performance in the systems� forward links. The robust performance of the\r\nsystems� backward links is clearly shown for the 900 MHz monopole antenna configuration, while the limitations in the\r\nbackward links of the other systems have to be overcome by the use of a second reader unit on the person�s back. The\r\nnovel feasibility analysis presented here allows to examine each system parameter individually and thus leads to\r\nreliable and robust backscatter RFID systems.
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