Abstract
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.
Highlights
Reconfigurable Intelligent surface (RIS) 1 assisted wireless communications have recently emerged as a promising solution to enhance the spectrum and energy efficiency of future wireless systems [1]–[5]
The main hurdle in computing the Radar Cross Section (RCS) of these finite structures hosting several resonators placed close to a ground plane is that the resonators and the metallic surface act as a Fabry-Perot interference device with multiple reflection contributions involved
The model is based on an analytical representation of the periodic surface via homogenized impedance and a transmission line circuit approach
Summary
Reconfigurable Intelligent surface (RIS) 1 assisted wireless communications have recently emerged as a promising solution to enhance the spectrum and energy efficiency of future wireless systems [1]–[5]. A RIS allows to control the wireless propagation environment via an array of reconfigurable passive reflecting elements [6]–[8]. A major limitation of current research on RISs in wireless networks is the lack of accurate models that describe the reconfigurable meta-surfaces as a function of their EM properties. We present an accurate and simple analytical model for the computation of the amplitude and phase response of the RIS which takes into account incidence angle and the coupling among elements.
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