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With the development of the next generation of mobile networks, new researchchallenges have emerged, and new technologies have been proposed to face them.On the one hand, the reconfigurable intelligent surface (RIS) technology isbeing investigated for partially controlling the wireless channels. The RIS isa promising technology for improving the signal quality by controlling thescattering of the electromagnetic waves in a nearly passive manner. On theother hand, ambient backscatter communications (AmBC) is another promisingtechnology that is tailored for addressing the energy efficiency requirementsfor the Internet of Things (IoT). This technique enables low-powercommunications by backscattering ambient signals and, thus, reusing existingelectromagnetic waves for communications. RIS technology can be utilized in thecontext of AmBC for improving the system performance. In this paper, we reporta prototype of an RIS that offers the capability of controlling the phase shiftof the reflected waves in a continuous manner, and we characterize itscharacteristics by using full-wave simulations and through experimentalmeasurements. Specifically, we introduce a phase shift model for predicting thesignal reflected by the RIS prototype. We apply the proposed model foroptimizing an RISassisted AmBC system and we demonstrate that the use of an RIScan significantly improve the system performance.

A Prototype of Reconfigurable Intelligent Surface with Continuous Control of the Reflection Phase