基于平面紧密耦合偶极子的$1$-Bit SubTHz RIS：波束成形与原型
$1$-Bit SubTHz RIS with Planar Tightly Coupled Dipoles: Beam Shaping and Prototypes
AI总结：
本文提出一种基于平面紧密耦合偶极子的$1$-bit宽带subTHz可重构智能表面，通过低成本PCB技术制造，并设计了快速近似波束成形优化方法与无源原型验证其宽带与波束指向性能。
摘要：
本文提出了一项$1$-bit宽带可重构智能表面（RIS）的概念验证研究，该表面由平面紧密耦合偶极子（PTCD）组成。所开发的RIS在subTHz频率下运行，全波电磁仿真表明，可获得以$102$ GHz为中心频率、$27.4\%$的$3$-dB增益带宽。每个RIS单元元件提供的二元相移是通过将反射波的极化改变$180^\circ$来实现的。所提出的基于PTCD的RIS具有平面配置，包含一层粘合到接地平面的介电层，因此可以使用低成本的印刷电路板（PCB）技术制造。我们解析计算了整个设计RIS的响应，并展示了该结果与等效全波仿真之间取得了良好的一致性。为了高效计算不同指向方向的$1$-bit RIS响应，从而设计定向波束码本，我们设计了一种快速近似波束成形优化方法，并将其与耗时的全波仿真进行了比较。最后，为了证明我们的概念，我们为所提出的$1$-bit宽带RIS展示了几个具有固定波束的无源原型。
英文摘要：
In this paper, a proof-of-concept study of a $1$-bit wideband reconfigurable intelligent surface (RIS) comprising planar tightly coupled dipoles (PTCD) is presented. The developed RIS operates at subTHz frequencies and a $3$-dB gain bandwidth of $27.4\%$ with the center frequency at $102$ GHz is shown to be obtainable via full-wave electromagnetic simulations. The binary phase shift offered by each RIS unit element is enabled by changing the polarization of the reflected wave by $180^\circ$. The proposed PTCD-based RIS has a planar configuration with one dielectric layer bonded to a ground plane, and hence, it can be fabricated by using cost-effective printed circuit board (PCB) technology. We analytically calculate the response of the entire designed RIS and showcase that a good agreement between that result and equivalent full-wave simulations is obtained. To efficiently compute the $1$-bit RIS response for different pointing directions, thus, designing a directive beam codebook, we devise a fast approximate beamforming optimization approach, which is compared with time-consuming full-wave simulations. Finally, to prove our concept, we present several passive prototypes with frozen beams for the proposed $1$-bit wideband RIS.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
