Multiport Network Modeling for Reconfigurable Intelligent Surfaces: Numerical Validation with a Full-Wave PEEC Simulator

Reconfigurable Intelligent Surface (RIS) modeling and optimization is a crucial step in developing the next generation of wireless communication.To this aim, the availability of accurate electromagnetic (EM) conformal models is paramount for the design of RIS-assisted communication links.In this work, we validate a widely-used analytical multiport model for RISs by means of a wellestablished full-wave numerical method based on the Partial Elements Equivalent Circuit (PEEC) paradigm.Numerical results show good agreement between the two methods, thus demonstrating i) the considered analytical description being effective and ii) the PEEC method being appropriate for EM modeling of RIS-assisted wireless links.