The UHF passive Radio Frequency Identification\udtechnology generally enables an asymmetric interaction between\udthe reader and the tag, the latter only being able to respond to\udthe query of the reader through backscattering modulation. Very\udrecently some experiments put into evidence the possibility to set\udup a tag-to-tag communication by using a simple illuminator.\udThe key issues and the physical limitation of such a crosslink\udare here investigated both theoretically and numerically by\udfully accounting for the mutual coupling among the tags, their\udradiation properties and the impedance modulation. The analysis\udreveals that the cross-link range may be optimized by a proper\uddesign of the tags’ input impedance and that alignment of a\udmultiplicity of tags could be able to communicate according to\uda simple routing strategy.
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机译：UHF无源射频识别\ ud技术通常可以使阅读器和标签之间实现非对称交互，后者只能通过反向散射调制来响应阅读器的查询。 \\最近，一些实验证明了使用简单的照明器来建立/建立标签间通信的可能性。\ ud在此，对这种交联的关键问题和物理局限性进行了\\理论上和数值上的研究\考虑标签之间的相互耦合，标签的\辐射特性和阻抗调制。分析\表明，可以通过对标签的输入阻抗进行适当的\ udesign设计来优化交联范围，并且\ u \ ud多样性的标签对齐方式可以根据\\简单的路由策略进行通信。
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