本文制备了以石墨粉为添加剂的结构吸波复合材料,研究了吸波剂含量和材料厚度对材料吸波性能的影响并分析了其相关机理.结果表明:随着石墨粉含量、材料厚度的增加,复合材料的最大吸收峰均向低频方向移动,实验试样中最大反射率可达-16.8dB,有效带宽约3GHz,具有一定的工程实用价值.复合材料的吸波性能与石墨粉含量、材料厚度密切相关,含量、厚度引起材料的电磁参数发生改变,进而导致吸波性能发生变化,电磁参数与吸波性能的规律有待进一步深入探讨.
Microwave absorbing properties of fibreglass composites with graphite additive as structural materials were studied. These materials have civilian applications in controlling electromagnetic interference and in the military as radar stealth coatings. The research goal was to evaluate the effect of material thickness and additive concentration on permittivity and absorption properties. Permittivity and reflectivity were measured with a vector network analyzer. The absorption curves shifted to lower frequencies with increasing additive content and with increasing material thickness, the maximum reflectivity of the sample is -16.8 dB at about 11.9GHz and the practical effective bandwidth is about 3 GHz, they can be used practically.
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