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. 2018 Aug 13;18(8):2663. doi: 10.3390/s18082663

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© 2018 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Example of non-desired RFID tag read due to multipath (in-channel interference). Item tagged with tag #A is within the coverage area of RFID antenna #1, while item tagged with tag #B is located outside the coverage area. Green arrows represent desired interrogation/response. Brown arrows show non-desired interrogation/response due to multipath affecting RFID antenna #1. Red arrows represent non-desired interrogation/response due to multipath affecting RFID antenna #2 (in this case, interrogation and response RFID signals are partially attenuated when passing through the wall).