Electromagnetic Model of Reflective Intelligent Surfaces

An accurate and simple analytical model for the computation of the reflection amplitude and phase of Reconfigurable Intelligent Surfaces is presented. The model is based on a transmission-line circuit representation of the RIS which takes into account the physics behind the structure including the effect of all relevant geometrical and electrical parameters. The proposed representation of the RIS allows to take into account the effect of incidence angle, mutual coupling among elements and the effect of the interaction of the periodic surface with the RIS ground plane. It is shown that the proposed approach allows to design a physically realisable RIS without recurring to onerous electromagnetic simulations. The proposed model aims at filling the gap between RIS assisted communications algorithms and physical implementation issues which determine realistic performance of these surfaces.

Automated summary

An accurate and simple analytical model for calculating the reflection amplitude and phase of Reconfigurable Intelligent Surfaces was presented. The model, based on a transmission-line circuit representation of the RIS, takes into account the relevant geometrical and electrical parameters to allow for consideration of various effects, such as incidence angle and mutual coupling among elements. The proposed model aims to bridge the gap between RIS communication algorithms and practical implementation issues to improve the realistic performance of these surfaces.