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Development of a hollow carbon sphere absorber displaying the multiple-reflection effect to attenuate electromagnetic waves

机译：空心碳球吸收器的开发具有多重反射作用，可减弱电磁波

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The development and use of hollow amorphous carbon spheres has been considered to be an efficient strategy to combat severe electromagnetic interference. In the current work, hollow carbon spheres were treated at various high temperatures to improve their graphitization levels and conductivity loss abilities in an attempt to best eliminate the unwanted electromagnetic wave. Of the various samples tested, the hollow carbon spheres obtained at 900 °C showed the best and excellent electromagnetic absorption, with a reflection loss value (RLmin) of up to ?23.0 dB and the ability to effectively absorb frequencies spanning a range of 4.4 GHz, when using a sample layer with a thickness of only 1.5 mm. A mechanism for the electromagnetic absorption was proposed. Besides the strong conductivity, the occurrence of multiple reflections of electromagnetic waves in the interior void was indicated to strengthen the attenuation of the electromagnetic wave.
机译：空心无定形碳球的开发和使用已被认为是抵抗严重电磁干扰的有效策略。在当前的工作中，中空碳球在各种高温下进行了处理，以改善其石墨化水平和电导率损失能力，以尽力消除不必要的电磁波。在所测试的各种样品中，在900°C下获得的中空碳球表现出最佳和优异的电磁吸收，反射损耗值（RL min ）高达？当使用厚度仅为1.5 mm的样品层时，具有23.0 dB的能力以及有效吸收4.4 GHz范围内频率的能力。提出了电磁吸收的机制。除了强电导率外，还表明了内部空间中电磁波的多次反射的出现，以加强电磁波的衰减。

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