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

翻译：可重构智能表面（RIS）建模与优化是开发下一代无线通信的关键步骤。为此，精确的电磁（EM）模型对于设计RIS辅助通信链路至关重要。本研究通过一种基于部分元等效电路（PEEC）方法的成熟全波数值技术，对广泛使用的RIS解析多端口网络模型进行了验证。数值结果表明两种方法具有良好的一致性，从而证明了：i) 所考虑的多端口网络模型的有效性；ii) PEEC方法适用于RIS辅助无线链路的电磁建模。