多径信号选择型超表面：利用无源时变互锁机制为同频信号改变空间阻抗
Multipath Signal-Selective Metasurface: Passive Time-Varying Interlocking Mechanism to Vary Spatial Impedance for Signals with the Same Frequency
AI总结：
本文提出一种基于超表面的无源时变互锁机制，通过耦合首个入射波调整空间阻抗，在无需有源偏置的情况下抑制同频多径干扰信号，并经数值与实验验证。
摘要：
电磁多径干扰难以用无源方法解决，原因在于两个物理限制：初始信号与干扰信号共享相同频率，且入射角可变。因此，要解决多径干扰，必须根据多个同频信号的入射角调整空间阻抗，而经典线性时不变（LTI）系统无法实现这一点。我们提出了一种基于超表面的空间滤波器设计概念，通过时变互锁机制克服LTI行为并抑制多径干扰信号，且无需任何有源偏置系统。所提出的器件与第一个到达的波耦合，以调整空间阻抗并在时域中抑制延迟波，数值仿真和实验均验证了这一点。本研究为无源但时变的选择性电磁超系统开辟了新途径，即使在同一频率下也能调整空间复杂的电磁波和场。
英文摘要：
Electromagnetic (EM) multipath interference is difficult to address with passive approaches due to two physical restrictions - the shared frequency of the initial and interfering signals and their variable incident angles. Thus, to address multipath interference, the spatial impedance must be adjusted in response to the incident angles of multiple signals with the same frequency, which is impossible with classic linear time-invariant (LTI) systems. We present a design concept for metasurface-based spatial filters to overcome LTI behavior and suppress multipath interference signals using a time-varying interlocking mechanism without any active biasing systems. The proposed devices are coupled to the first incoming wave to adjust the spatial impedance and suppress delayed waves in the time domain, which is validated numerically and experimentally. This study opens a new avenue for passive yet time-varying selective EM metasystems, enabling the adjustment of spatially complicated EM waves and fields even at the same frequency.
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