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. 2015 Jun 10;15(6):13591–13626. doi: 10.3390/s150613591

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Configuration of the antennas and coverage of RFID sensors: (a) One antenna on the right side of a sidewalk; (b) Three antennas on the right, left and top of a sidewalk.