Multipath Signal-Selective Metasurface: Passive Time-Varying Interlocking Mechanism to Vary Spatial Impedance for Signals with the Same Frequency

arXiv - PHYS - Applied Physics Pub Date : 2024-09-04 DOI:arxiv-2409.02484

Kaito Tachi, Kota Suzuki, Kairi Takimoto, Shunsuke Saruwatari, Kiichi Niitsu, Peter Njogu, Hiroki Wakatsuchi

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Abstract

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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多径信号选择性元表面：改变同频信号空间阻抗的无源时变互锁机制

电磁（EM）多径干扰由于两个物理限制而很难用被动方法来解决--初始信号和干扰信号的频率相同，而且它们的入射角度可变。因此，要解决多径干扰问题，必须根据频率相同的多个信号的入射角度调整空间阻抗，而这在经典的线性时不变（LTI）系统中是不可能实现的。我们提出了一种基于元表面的空间滤波器设计理念，利用时变互锁机制克服 LTI 行为并抑制多径干扰信号，而无需任何有源偏置系统。所提出的器件与第一个入射波耦合，以调整空间阻抗并抑制时域延迟波，这在数值和实验上都得到了验证。这项研究为无源时变选择性电磁元系统开辟了一条新途径，即使在相同频率下也能调节空间复杂的电磁波和电磁场。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Applied Physics

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