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首页> 外文期刊>IEEE Transactions on Antennas and Propagation >Feasibility Study of Using Electrically Conductive Concrete for Electromagnetic Shielding Applications as a Substitute for Carbon-Laced Polyurethane Absorbers in Anechoic Chambers
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Feasibility Study of Using Electrically Conductive Concrete for Electromagnetic Shielding Applications as a Substitute for Carbon-Laced Polyurethane Absorbers in Anechoic Chambers

机译：在电磁波屏蔽室中使用导电混凝土替代电波暗室中碳带聚氨酯吸收剂的可行性研究

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This paper investigates conductive concrete in electromagnetic shielding applications as a viable alternative to carbon-laced polyurethane, which is used as an absorber material in anechoic chambers. To greatly increase concrete's electromagnetic shielding performance, carbon black, graphite powder, and steel fibers are introduced to its composition. Samples of conductive concrete have been prepared and its shielding effectiveness is evaluated. The test method is based on using power spectrum analysis to characterize the degree of shielding due to the different mechanisms of reflection and absorption. The tested samples are in the shape of anechoic chambers pyramidal cones, to provide gradual impedance gradient. Slabs with flat surface are also built and tested in order to compare the results. Measured data are then compared with published figures for commercial chamber performances. The range of frequency tested is from 1 to 5.5 GHz. The pyramidal conductive concrete samples yield an excellent shielding effectiveness of approximately 65 dB as opposed to the carbon-laced polyurethane performance of 50 dB.
机译：本文研究了电磁屏蔽应用中的导电混凝土，以作为碳涂层聚氨酯（在消声室中用作吸收材料）的可行替代方案。为了大大提高混凝土的电磁屏蔽性能，将炭黑，石墨粉和钢纤维引入其组成。制备了导电混凝土样品并评估了其屏蔽效果。该测试方法基于使用功率谱分析来表征由于反射和吸收机制不同而引起的屏蔽程度。测试的样品呈消声室锥体的形状，以提供渐进的阻抗梯度。为了比较结果，还建造并测试了具有平坦表面的平板。然后将测得的数据与已发布的数据进行比较，以了解其商业性能。测试的频率范围是1到5.5 GHz。金字塔形导电混凝土样品产生约65 dB的出色屏蔽效果，而碳包覆聚氨酯的性能为50 dB。

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