We propose reconfigurable anomalous reflectors with stretchable elastic substrates. The proposed reflector dynamically controls the reflection direction by mechanically stretching the substrate to induce a physical change of the unit cell period. Owing to the simple and scalable tuning mechanism, the proposed approach is applicable in the millimeter-wave and terahertz bands for a wide reflection steering. To demonstrate the proposed approach, stretchable anomalous reflectors are designed at 140 GHz for normal incident waves. From full-wave simulations, we numerically confirm that highly efficient anomalous reflections with suppressed parasitic reflections in the undesired directions are achieved toward shallower angles as the substrate is stretched. We experimentally demonstrate that the proposed reflectors allow a dynamic control of the reflection direction with wide steering ranges of more than 20°. Moreover, we confirm that the measured efficiencies of the anomalous reflections hardly deteriorate when stretching and maintain practically acceptable performances of over 50 %. The proposed stretchable reflectors have a potential to be used for a reconfigurable intelligent surface (RIS) that realizes dynamic optimizations of the wireless environment in the 6G communication.

中文翻译：

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具有 140 GHz 频段可拉伸弹性基板的可重构反常反射器

我们提出了具有可拉伸弹性基板的可重构异常反射器。所提出的反射器通过机械拉伸基板以引起晶胞周期的物理变化来动态控制反射方向。由于简单且可扩展的调谐机制，所提出的方法适用于毫米波和太赫兹波段的宽反射控制。为了演示所提出的方法，可拉伸异常反射器设计为 140 GHz 用于正常入射波。从全波模拟中，我们在数值上证实，随着基板被拉伸，在不需要的方向上抑制寄生反射的高效反常反射是朝着更浅的角度实现的。我们通过实验证明，所提出的反射器可以动态控制反射方向，转向范围超过 20°。此外，我们确认异常反射的测量效率在拉伸时几乎不会恶化，并保持超过 50% 的实际可接受的性能。所提出的可拉伸反射器有可能用于可重构智能表面 (RIS)，实现 6G 通信中无线环境的动态优化。