An indicator of being a strong country in today's world is that they have powerful weapons. In this sector where science is used exceedingly, the “stealth” takes an important place. Radar-absorbing materials are used in stealth technology to disguise an object from radar detection, such that it can allow a plane to be perceived as a bird. In this study, Co-doped zinc oxide reinforced styrofoam sheet composites were manufactured as radar-absorbing materials. For this purpose, Co-doped zinc–ZnO particles were synthesized via the Sol-Gel method with doping concentrations of 0%, 3%, 6%, 9%, and 12%. They were embedded in a styrofoam matrix with different loading levels to see the concentration dependence. The as-prepared powders were characterized by using X-ray diffraction and Scanning Electron Microscope-Energy Dispersive Spectroscopy. Magnetic characterization of samples was carried out using a vibrating sample magnetometer. Finally, the radar-absorbing test was applied with a network analyzer to achieve the main purpose of this research. It was concluded that Co-doped zinc oxide reinforced composites have electromagnetic properties that indicate potential applications in the radar-absorbing area.

中文翻译：

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溶胶-凝胶法合成磁性Co掺杂氧化锌颗粒制备吸波复合材料

当今世界强国的一个标志就是拥有强大的武器。在这个过度使用科学的领域，“隐身”占据了重要位置。雷达吸收材料用于隐身技术，以掩盖雷达探测中的物体，从而使飞机被视为鸟。在这项研究中，Co 掺杂氧化锌增强泡沫聚苯乙烯板复合材料被制造为雷达吸收材料。为此，通过溶胶-凝胶法合成了掺杂浓度为 0%、3%、6%、9% 和 12% 的 Co 掺杂的锌-ZnO 颗粒。它们被嵌入具有不同负载水平的泡沫聚苯乙烯基质中，以查看浓度依赖性。通过使用 X 射线衍射和扫描电子显微镜-能量色散光谱表征所制备的粉末。使用振动样品磁强计进行样品的磁表征。最后，结合网络分析仪进行雷达吸波测试，达到本研究的主要目的。结果表明，Co掺杂氧化锌增强复合材料具有电磁特性，表明在雷达吸收领域具有潜在应用。