Magnetic-loss type electromagnetic wave (EMW) absorbing materials have been always focused on EMW absorbing field due to their excellent magnetic loss properties. However, the impedance mismatching issue still restrict the utilization for those materials. In this work, Ce₂Fe₁₇N_3-δ was synthesized and further coated by silica (Ce₂Fe₁₇N_3-δ@SiO₂) for optimizing impedance matching and EMW absorbing performance. The reflection loss (RL) value of Ce₂Fe₁₇N_3-δ@SiO₂ absorber is ~−63.5 dB at 7.86 GHz with thickness of 1.96 mm under 30 vol% loading. Moreover, the effective attenuation bandwidth (EAB: $\mathrm{RL}<-10\mathrm{dB}$) is ~6.94 GHz under 1.26 mm, which covers the X- and Ku-band. Compared to pristine Ce₂Fe₁₇N_3-δ absorber, the Ce₂Fe₁₇N_3-δ@SiO₂ endows boosted EMW absorbing performance and broad bandwidth under lower thicknesses. The enhanced related performance is mainly attributed to the optimized impedance matching because of the silica coating.

磁损耗型电磁波（EMW）吸收材料由于其优异的磁损耗特性，一直被关注于电磁波吸收领域。然而，阻抗失配问题仍然限制了这些材料的利用。在这项工作中，合成了Ce ₂ Fe ₁₇ N _3-δ并进一步用二氧化硅（Ce ₂ Fe ₁₇ N _3-δ @SiO ₂）包覆，以优化阻抗匹配和 EMW 吸收性能。Ce ₂ Fe ₁₇ N _3-δ @SiO ₂的反射损耗（RL）值吸收器在 7.86 GHz 时为 ~-63.5 dB，在 30 vol% 负载下厚度为 1.96 mm。此外，有效衰减带宽（EAB：$\mathrm{强化学习}<-10\mathrm{D\; b}$) 在 1.26 mm 下约为 6.94 GHz，涵盖X和Ku频段。与原始的 Ce ₂ Fe ₁₇ N _3-δ吸收剂相比，Ce ₂ Fe ₁₇ N _3-δ @SiO ₂在较低的厚度下具有增强的 EMW 吸收性能和宽带宽。增强的相关性能主要归功于由于二氧化硅涂层而优化的阻抗匹配。