标题： 多频段系统模型用于多端口时变散射体 显示英文标题

标题： Multifrequency system model for multiport time-modulated scatterers

摘要： 在通信工程中利用散射体，如可重构智能表面（RISs）和背散射系统，需要物理上一致的模型以实现准确的性能预测。 针对非周期性散射体，已经开发了一个多端口模型，该模型还考虑了结构散射。 然而，许多新兴系统在多个频率下运行或产生互调谐波，特别是在结合空时调制（STM）或动态负载控制时。 这些功能要求能够同时捕捉多个频率和方向上的散射行为的先进建模方法。 本文扩展了一个基于多端口S参数的模型，用于预测多频段工作结构的散射特性。 该模型将便捷的S矩阵模型的应用范围扩展到时变多端口结构。 与已知的方法不同，该模型结合了结构散射、互耦、非数字调制的可能性以及非周期性配置，从而实现了对广泛通信和传感系统的精确分析和优化。 与一个空时调制散射结构的实验结果进行对比验证，证明了所提出模型的准确性和实际适用性。 显示英文摘要

摘要： Utilizing scatterers in communication engineering, such as reconfigurable intelligent surfaces (RISs) and backscatter systems, requires physically consistent models for accurate performance prediction. A multiport model, which also accounts for structural scattering, has been developed for non-periodic scatterers. However, many emerging systems operate at multiple frequencies or generate intermodulation harmonics, particularly when incorporating space-time modulation (STM) or dynamic load control. These functionalities demand advanced modeling approaches capable of capturing scattering behavior across several frequencies and directions simultaneously. This article extends a multiport S-parameters-based model for predicting the scattering properties of multifrequency operating structures. The model extends the applicability of convenient S-matrix models to time-modulated multiport structures. Unlike known approaches, this model incorporates structural scattering, mutual coupling, the possibility of non-digital modulation, and non-periodic configurations, enabling precise analysis and optimization for a broad range of communication and sensing systems. Validation against experimental results for a space-time modulated scattering structure demonstrates the accuracy and practical applicability of the proposed model.