The direct design of metamaterial absorbers for the nonplanar surface is cumbersome and inefficient. A new mapping between nonexpandable surfaces and plane structures is proposed, in which the size of geometry on the unit is scaled to avoid the overlap after the mapping. Utilizing this mapping, it is easy to realize the metamaterial absorbers for nonexpandable surfaces, such as the spherical surface, while maintaining or even getting better performance by adopting the genetic algorithm combined with the load‐resistors matrix decomposition method. A prototype has been fabricated by 3D printing technology to precisely locate the units on the spherical crown. The simulation and experimental results show that the designed structure has broadband absorbing bandwidth in the 2.7 to 8.2 GHz for 10 dB radar cross‐section reduction under the normal incidence. This prototype also has good polarization and incident angle stability.

中文翻译：

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用于设计球形共形超材料吸收体的新的不可扩展表面映射

用于非平面表面的超材料吸收器的直接设计麻烦且效率低下。提出了不可扩张表面与平面结构之间的新映射，其中缩放了单元上的几何尺寸以避免映射后的重叠。利用这种映射，通过采用遗传算法结合负载电阻矩阵分解方法，可以很容易地实现用于非膨胀表面（例如球形表面）的超材料吸收器，同时保持甚至获得更好的性能。通过3D打印技术制造了一个原型，以将单元精确定位在球形冠上。仿真和实验结果表明，所设计的结构在2.7至8之间具有宽带吸收带宽。在垂直入射下将雷达横截面减小2 GHz，可降低10 dB。该原型还具有良好的偏振和入射角稳定性。