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Limitations of Forward and Return Links in UHF RFID with Passive Tags

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Author(s): Zahra'a M. Bakir | Haider M. AlSabbagh

Journal: International Journal of Engineering Trends and Technology
ISSN 2231-5381

Volume: 5;
Issue: 5;
Start page: 238;
Date: 2013;
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Keywords: RFID | UHF RFID | passive tags | free space channel | limitations of forward and reverse links.

ABSTRACT
Backscatter radio wireless communication by modulating signals scattered from a radio frequency transponder (RF tag) is fundamentally different from conventional radio because it involves two distinct links: the power-up (forward) link for powering the passive RF tags, and the back scatter (return) link for the describing back scatter communication. Because of severe power limitations on the RF tag such as chip sensitivity, antenna gain, antenna polarization and impedance match, a thorough knowledge of the back scatter channel is necessary to maximize back scatter-radio andradio-frequency identification (RFID) system performance. This paperexamines the relative roles of the forward and reverse links indetermining power received in tag, return power in reader, power ratio and the operational range of passive UHF RFID systems.It analysed the limitations imposed on the range performance of passive UHF RFID systems by such factors as tag characteristics, propagation environment, and RFID reader parameters.

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