arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.13529eess.SPcs.ITmath.IT
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可重构智能表面的角度相关移相器模型:角度互易性成立吗?

Angle-Dependent Phase Shifter Model for Reconfigurable Intelligent Surfaces: Does the Angle-Reciprocity Hold?

Weicong Chen, Lin Bai, Wankai Tang, Shi Jin, Wei Xiang Jiang, Tie Jun Cui

摘要:

现有的可重构智能表面(RIS)移相器模型忽略了电磁波的传播特性,无法反映RIS对无线通信系统的实际影响。基于变容二极管的等效电路,提出了一种角度相关移相器模型。据我们所知,这是第一个移相器模型,它揭示了电磁波的入射角对RIS的反射系数的影响。此外,角倒易上的RIS进行了研究,并进一步证明了成立时,相邻的RIS单元格的反射相位差是不变的一个撞击的电磁波和它的反向入射的。通过全波仿真验证了RIS的角度相关特性。根据分析和仿真结果,我们发现基于变容二极管的RIS的角度互易性仅在正向和反向电磁波的小入射角下成立,从而限制了RIS辅助TDD系统中的信道互易性。

英文摘要:

The existing phase shifter models adopted for reconfigurable intelligent surfaces (RISs) have ignored the electromagnetic (EM) waves propagation behavior, thus cannot reveal practical effects of RIS on wireless communication systems. Based on the equivalent circuit, this paper introduces an angle-dependent phase shifter model for varactor-based RISs. To the best of our knowledge, this is the first phase shifter model which reveals that the incident angle of EM waves has influence on the reflection coefficient of RIS. In addition, the angle-reciprocity on RIS is investigated and further proved to be tenable when the reflection phase difference of adjacent RIS unit cells is invariant for an impinging EM wave and its reverse incident one. The angle-dependent characteristic of RIS is verified through full-wave simulation. According to our analysis and the simulation results, we find that the angle-reciprocity of varactor-based RIS only holds under small incident angles of both forward and reverse incident EM waves, thus limits the channel reciprocity in RIS-assisted TDD systems.

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