Electromagnetic wave (EMW) pollution impairs the performance of equipment, facilities, information security, and human health. Ordinary, plain cementitious composite has limited EMW-reflecting capacity. To correct this, a macrostructure EMW absorbing element has been developed to reduce EMW pollution. As conventional casting of macrostructures is not cost-effective and lacks quality because of the demand for special formwork, 3D printing technology offers greater design flexibility, higher efficiency, and improved mechanical properties. Moreover, the surface texture of 3D-printed material exhibits natural corrugation to enhance EMW reflection further. In this study, novel wave-shaped EMW absorbing elements were fabricated using 3D cementitious printing technology. The EMW absorbing performance was analyzed by the naval research laboratory (NRL) system in the range of 1 GHz–18 GHz. Significant improvement of reflectivity was observed, especially in the low-frequency range. The optimum configuration was identified through effectiveness evaluation to be a K₃ sample with 45 mm of heave height and 2/3 tan(θ), exhibiting a minimum reflectivity −43.7 dB, mean reflectivity −25 dB, and an absorbing bandwidth of 18 GHz. The experimental reflectivity was also simulated by the finite element method, which agrees with the experimental results. The synthetic vector electromagnetic field distribution was also studied to explore space impedance characteristics. Moreover, the finite element method attempted to correct drawbacks in experiments, including multiple direction reflection measurement and wave-number interruption. Based on simulation calibration, the influence of wave-shaped parameters (heave height and tangent value) upon EMW absorbing capacity was induced accurately.

电磁波（EMW）污染会损害设备，设施，信息安全和人体健康的性能。普通的普通水泥基复合材料的EMW反射能力有限。为了纠正这个问题，已经开发出一种宏观结构的EMW吸收元件以减少EMW污染。由于需要特殊的模板，常规的宏观结构铸造成本效益不高且质量低下，因此3D打印技术可提供更大的设计灵活性，更高的效率和更佳的机械性能。此外，3D打印材料的表面纹理表现出自然的波纹，从而进一步增强了EMW反射。在这项研究中，使用3D胶结印刷技术制造了新型的波浪形EMW吸收元件。海军研究实验室（NRL）系统分析了1 GHz–18 GHz范围内的EMW吸收性能。观察到反射率的显着提高，尤其是在低频范围内。通过有效性评估确定最佳配置为K_3个具有45 mm隆起高度和2/3 tan（θ）的样品，表现出最小反射率-43.7 dB，平均反射率-25 dB和18 GHz的吸收带宽。实验反射率也通过有限元方法进行了模拟，与实验结果吻合。还研究了合成矢量电磁场分布，以探索空间阻抗特性。此外，有限元方法试图纠正实验中的缺陷，包括多方向反射测量和波数中断。基于仿真标定，准确地得出了波浪形参数（高低和切线值）对电磁波吸收能力的影响。