Here, we proposed an ingenious grid pattern design method called pattern randomization to obtain metallic meshes with uniform stray light. The periodicity of a grid is weakened by the pattern randomization. By comparing the diffraction patterns of one-dimensional periodic grid, one-dimensional aperiodic grid and concentric rings structure, we found that the “radial homogenization” and “angular homogenization” can uniform the high-order diffracted energy. The pattern randomization is proposed to achieve the “radial homogenization” and “angular homogenization” two-dimensional grid while ensuring connectivity. For collimated incident beam, the metal grid with a randomness (90%, 90%) obtained by pattern randomization method generates uniform stray light, while it maintains high visible light transmittance and high electromagnetic shielding efficiency (SE). The simulated results are experimentally verified that the high-order diffraction spots can be effectively suppressed. The coefficient C_v is reduced from 1078.14% to 164.65%. Meanwhile, the randomness of the designed grid structure hardly affects the visible light transmittance and shielding efficiency. The metallic mesh with a shielding efficiency about 17.3 dB in the Ku-band, a relative transmittance higher than 94% in the visible light band and an ultra-uniform diffraction pattern is obtained.

中文翻译：

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模式随机化：设计具有均匀杂散光的高性能金属网格以屏蔽EMI的有效方法

在这里，我们提出了一种巧妙的网格图案设计方法，称为图案随机化，以获得具有均匀杂散光的金属网格。图案的随机化削弱了网格的周期性。通过比较一维周期网格，一维非周期性网格和同心环结构的衍射图谱，我们发现“径向均质化”和“角均质化”可以使高阶衍射能量均匀。提出模式随机化以在确保连通性的同时实现“径向均匀化”和“角度均匀化”二维网格。对于准直入射光束，通过图案随机化方法获得的具有随机性（90％，90％）的金属栅格会产生均匀的杂散光，同时保持高可见光透射率和高电磁屏蔽效率（SE）。仿真结果经过实验验证，可以有效抑制高阶衍射斑。系数C _v从1078.14％降低至164.65％。同时，设计的网格结构的随机性几乎不会影响可见光的透射率和屏蔽效率。得到的金属网在Ku波段的屏蔽效率约为17.3dB，在可见光波段的相对透射率高于94％，并且具有超均匀的衍射图。