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Electromagnetic Models for Passive Tag-to-Tag Communications

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2 Author(s)
Marrocco, G. ; DISP, University of Rome, Tor Vergata, Italy ; Caizzone, S.

The UHF passive radio frequency identification technology generally enables an asymmetric interaction between the reader and the tag, the latter only being able to respond to the query of the reader through backscattering modulation. Very recently, some experiments put into evidence the possibility to set up a tag-to-tag communication by using a simple illuminator. The key issues and the physical limitation of such a cross-link are here investigated both theoretically and numerically by fully accounting for the mutual coupling among the tags, their radiation properties and the impedance modulation. The analysis reveals that the cross-link range may be optimized by a proper design of the tags' input impedance and that alignment of a multiplicity of tags could be able to communicate according to a simple routing strategy.

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Antennas and Propagation, IEEE Transactions on  (Volume:60 ,  Issue: 11 )