Department of Electrical and Electronics Engineering Middle East Technical University, Ankara, Turkey.
Sci Rep. 2018 Jan 19;8(1):1267. doi: 10.1038/s41598-017-18174-4.
A multigrid optimisation strategy is introduced to design passive metallic reflectors with corrugated shapes. The strategy is based on using genetic algorithms at multiple grids and shaping the metal sheets, starting from coarse details to fine tunings. This corresponds to a systematic expansion of the related optimisation space, which is explored more efficiently in comparison to a brute-force optimisation without using grid. By employing the multilevel fast multipole algorithm to analyse the electromagnetic problems corresponding to optimisation trials, we obtain accurately designed reflectors that provide focussing abilities with very high performances at single and multiple locations. The designed reflectors are also resistant to fabrication errors with less complex corrugations and simplified reflection mechanisms compared to those found by no-grid optimisation trials.
一种多网格优化策略被引入来设计具有波纹形状的无源金属反射器。该策略基于在多个网格上使用遗传算法，并从粗糙细节到微调来塑造金属板。这对应于相关优化空间的系统扩展，与不使用网格的盲目优化相比，这种扩展能够更有效地探索优化空间。通过使用多层快速多极算法来分析与优化试验对应的电磁问题，我们得到了精确设计的反射器，这些反射器在单个和多个位置提供了具有非常高性能的聚焦能力。与无网格优化试验相比，所设计的反射器还具有抗制造误差的能力，其波纹更简单，反射机制也更简单。
