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A printer-encoder antenna has to reliably communicate with only one targeted tag among a number of tightly spaced transponders in very close proximity. Moreover, the distance between the encoder and transponder antennas is typically a few millimeters only. Thus, antennas for UHF-RFID printer encoders are more similar to electromagnetic couplers than to antennas, and a specific analysis is required...
Performance of a phase-based localization technique for UHF-RFID tags moving on a conveyor belt are analyzed through a measurement campaign in a real scenario. Phase data are acquired through off-the-shelf UHF-RFID equipment and the performance are shown in terms of location accuracy.
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