In this study, Ag-decorated [email protected] powders were prepared by electroless plating method with [email protected] powders as the raw material. The various characteristics of the composite powders, such as their phase composition and structure, were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The effects of different Ag content on the size distribution of the particles were also studied by a laser particle size analyzer. The network vector analyzer additionally measured the electromagnetic properties of Ag-decorated [email protected] powders/paraffin samples. The electromagnetic wave absorption properties of the samples with different thicknesses were studied. The results of XRD and SEM show that with the increase of Ag content, the Ag plating effect of [email protected] powders increases first and then decreases. The results of laser particle size analyzer show that with the increase of Ag content, the particle size and distribution of Ag-decorated [email protected] powders become larger and wider. Through the analysis of the microwave absorption performance of Ag-decorated [email protected] powders/paraffin sample, it can be concluded that in the frequency range of 8.2–12.4$$GHz, when the thickness is 2.6$$mm, the Ag-decorated [email protected] powders with a silver mass ratio of 25$$wt.% have good electromagnetic wave absorption performance. The reflection loss is less than −10 dB in the whole frequency range, and the peak value reaches −55.36 dB at 9.92$$GHz. In addition, the frequency selective surface coupled by circular element and square ring element improves the microwave absorption performance of the sample containing 15$$wt.% Ag content with 2$$mm thickness. The reflection loss is lower than −10 dB with the peak reflection loss of −36.73 dB at 10.98$$GHz in the whole frequency range. The simulation results show that the loading frequency selective surface can reduce the silver content and make it have better microwave absorption performance and low cost.

本研究以[email protected]粉末为原料，采用化学镀方法制备了Ag修饰的[email protected]粉末。通过X射线衍射（XRD）和扫描电子显微镜（SEM）技术研究了复合粉末的各种特性，例如其相组成和结构。利用激光粒度分析仪研究了不同Ag含量对颗粒尺寸分布的影响。网络矢量分析仪还测量了镀银[电子邮件保护]粉末/石蜡样品的电磁特性。研究了不同厚度样品的电磁波吸收特性。XRD和SEM结果表明,随着Ag含量的增加, [email protected]粉末的镀银效果先增强后减弱。激光粒度分析仪结果表明，随着Ag含量的增加，Ag修饰粉体的粒径和分布变得更大、更宽。通过对Ag装饰[email protected]粉末/石蜡样品的微波吸收性能分析可以得出，在8.2~12.4频率范围内$$GHz，厚度为2.6时$$mm，银装饰[email protected]粉末，银质量比为25$$wt.% 具有良好的电磁波吸收性能。全频段反射损耗小于-10 dB，9.92处峰值达到-55.36 dB$$兆赫。此外，圆形元件和方环元件耦合的频率选择表面提高了含有15的样品的微波吸收性能。$$wt.% Ag 含量 2$$毫米厚度。反射损耗低于-10 dB，10.98处峰值反射损耗为-36.73 dB$$GHz 在整个频率范围内。仿真结果表明，加载选频表面可以降低银含量，使其具有更好的微波吸收性能且成本较低。