Chen Jianzhong, Zhang Chengwei, Zhao Yutong, Lin Lei, Li Liang, Su Tao, Wu Bian, Ding Jinshan
National Key Laboratory of Antennas and Microwave Technology, Xidian University, Xi'an 710071, China.
Nanjing Research Institute of Electronics Technology, Nanjing 210039, China.
Materials (Basel). 2021 Sep 3;14(17):5053. doi: 10.3390/ma14175053.
A polarization-insensitive diffusion metasurface using a period-changed unit cell is presented for reducing the radar cross-section (RCS) of metallic objects in ultrawideband. Two metallic Minkowski loops are proposed as coding elements, different from traditional designs. The "0" element is constructed by period-changed unit cells to achieve a 180 ± 30° phase difference with the same reflection amplitude of nearly -0.9 dB in an ultrawideband from 7.1 to 29.2 GHz. Multilayer geometry with a thickness of 4.5 mm (about 0.105λ at the lowest operating frequency) and rotational symmetry loops are used to realize the ultrawideband characteristic and polarization-insensitive behavior. For verification, a polarization-insensitive diffusion metasurface is designed, fabricated, and measured. The simulated and measured results of the diffusion metasurface are in good consistency and the results both show that the metasurface enables a 10 dB backscattering reduction over an amazing ultrawideband ranging from 7.1 to 29.2 GHz (BW of 122%).
提出了一种使用周期变化单元结构的极化不敏感扩散超表面，用于降低超宽带中金属物体的雷达散射截面（RCS）。提出了两种金属闵可夫斯基环作为编码元件，这与传统设计不同。“0”元件由周期变化的单元结构构成，以便在7.1至29.2 GHz的超宽带内实现180±30°的相位差，且具有几乎-0.9 dB的相同反射幅度。采用厚度为4.5 mm（在最低工作频率下约为0.105λ）的多层几何结构和旋转对称环来实现超宽带特性和极化不敏感行为。为进行验证，设计、制作并测量了一种极化不敏感扩散超表面。扩散超表面的模拟和测量结果具有良好的一致性，结果均表明该超表面在7.1至29.2 GHz的惊人超宽带范围（带宽为122%）内可实现10 dB的后向散射降低。
