This paper analyzes the working principle of X-Shaped reconfigurable intelligent surface (RIS) in detail and reveals the different types of RIS that can be designed based on this structure. Combined with the design examples using this structure in the currently published articles, this paper summarizes and organizes them, and finally, based on this X-Shaped structure, this paper explores some other possible designs, which reflects the potential of the design versatility of the X-RIS structure.

翻译：本文详细分析了X形可重构智能表面（RIS）的工作原理，揭示了基于该结构可设计的不同类型RIS。结合当前已发表文献中采用该结构的设计实例，本文对其进行了总结与梳理，并最终基于此X形结构，探讨了其他一些可能的设计方案，体现了X-RIS结构在设计多样性方面的潜力。