论文标题
可重新配置的智能表面：MIMO还是辐射板？
Reconfigurable Intelligent Surface: MIMO or radiating sheet?
论文作者
论文摘要
可重新配置的智能表面（RIS）重定向并可能修改入射波的属性，旨在恢复非视线通信链接。由基本散射器组成，迄今为止，RI被视为具有类似于天线的点散射器的集合，在等效的大型MIMO通信链路中。尽管RIS具有离散的性质，但当前的设计方法通常将RI视为连续的辐射表面，随后被离散化。在这里，我们研究了两种方法之间的联系，以弥合两种不同的观点。我们从分析上找到了使两种方法等效的因素，并以与天线理论一致的常用辐射模式和特性建模为天线的RIS元素的示例演示了我们的发现。我们分析了两种理论方法在RIS元素的设计方面之间的等价性，例如增益，方向性和元素之间的耦合，目的是洞悉观察到的差异，对哪些差异对于评估RIS效率至关重要。
A Reconfigurable Intelligent Surface (RIS) redirects and possibly modifies the properties of incident waves, with the aim to restore non-line-of-sight communication links. Composed of elementary scatterers, the RIS has been so far treated as a collection of point scatterers with properties similar to antennas in an equivalent massive MIMO communication link. Despite the discrete nature of the RIS, current design approaches often treat the RIS as a continuous radiating surface, which is subsequently discretized. Here, we investigate the connection between the two approaches in an attempt to bridge the two different perspectives. We analytically find the factor that renders the two approaches equivalent and we demonstrate our findings with examples of RIS elements modeled as antennas with commonly used radiation patterns and properties consistent with antenna theory. We analyze the equivalence between the two theoretical approaches with respect to design aspects of the RIS elements, such as gain, directivity and coupling between elements, with the aim to provide insight into the observed discrepancies, the understanding of which is crucial for assessing the RIS efficiency.
