Shape-changing mechanical metamaterials have drawn the attention of researchers toward the development of continuous-range tunable frequency selective surfaces (FSSs). In this paper, a novel tunable FSS utilizing an origami-inspired “eggbox” structure is presented featuring four-degrees of freedom that can change the frequency response of two orthogonal linear polarizations. The centrosymmetric “eggbox” structure can be folded or rotated along two axes that lead to unprecedented reconfigurability compared to traditional Miura-Ori-based structures which have fewer degrees of control. The utilized cross-shaped dipole FSS element shows enhanced bandwidth, support for orthogonal linear polarization, and ease of fabrication. The prototype is fabricated using a low-cost fully additive inkjet printing process with silver nanoparticle conductive ink. The outcome of this study shows a 25% frequency tunable range over two polarization directions. The design can be an ideal spatial filtering candidate for advanced ultra-wideband terrestrial and space applications.

中文翻译：

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一种使用折纸“蛋盒”结构的新型 4 自由度宽范围可调谐频率选择表面

形状变化的机械超材料已引起研究人员对连续范围可调谐频率选择表面 (FSS) 的开发的关注。在本文中，提出了一种利用折纸启发的“蛋盒”结构的新型可调谐 FSS，具有四个自由度，可以改变两个正交线性极化的频率响应。与控制程度较低的传统基于 Miura-Ori 的结构相比，中心对称的“蛋盒”结构可以沿两个轴折叠或旋转，从而实现前所未有的可重构性。所使用的十字形偶极 FSS 元件显示出更高的带宽、支持正交线性极化和易于制造。该原型是使用低成本的全添加剂喷墨印刷工艺和银纳米粒子导电油墨制造的。这项研究的结果表明，在两个极化方向上有 25% 的频率可调范围。该设计可以成为高级超宽带地面和空间应用的理想空间滤波候选者。