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Progress In Electromagnetics Research
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SIGNAL DESCRIPTIONS AND FORMULATIONS FOR LONG RANGE UHF RFID READERS

By Z. Fan, S. Qiao, J. T. Huang-Fu, and L.-X. Ran

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Abstract:
In this paper, signal descriptions and formulations for the radio frequency (RF) front-end of a passive backscatter radio frequency identification (RFID) reader working at ultra high frequencies (UHF) are discussed in detail, and a set of design considerations aiming to improve the read range are outlined. The reader's architecture is proposed and the design details of its RF frond-end are presented. The read range is formulated through calculating the time-averaging power absorbed by the tag and the signal-noise-ratio (SNR) of the demodulation, and accordingly RFID systems can be classified into tag-determining and reader-determining ones. It is concluded that the gain of the reader antenna, the phase noise of the local oscillation (LO) and the receive-transmit isolation coefficient dominate the demodulation output noise of the reader, and consequently the readerdetermining maximum operational distance. A prototype reader working at the frequency of 915MHz was built with off-the-shelf components and was evaluated with a commercial tag in an indoor environment. The measured results show that this RFID system is of tag-determining and has a read range of 8.4 meters, which are in good agreement with the calculated results.

Citation: (See works that cites this article)
Z. Fan, S. Qiao, J. T. Huang-Fu, and L.-X. Ran, "Signal Descriptions and Formulations for Long Range UHF RFID Readers," Progress In Electromagnetics Research, Vol. 71, 109-127, 2007.
doi:10.2528/PIER07021501
http://www.jpier.org/PIER/pier.php?paper=07021501

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