泡沫吸波材料结构对吸波性能的影响

为了研究吸波材料结构与吸波性能的关系,以无机泡沫吸波材料作为基体,采用多层复合研究阻抗匹配特性对吸波性能的影响,当材料为"透波层/吸收层"的2层复合结构时,在2.0~18.0 GHz频段反射率均小于-10.0dB,且于12.7 GHz处出现最大衰减峰为-21.5 dB.采用角锥和锥台处理研究材料表面构造对吸波性能的影响,结果表明:表面处理可以明显提高材料吸波性能,且角锥处理优于锥台处理.5×5阵列角锥的有效吸收带宽(反射率小于-10.0 dB)为15.3 GHz,反射率在9.4 GHz处到达最小值为-43.4 dB;8×8阵列角锥的有效吸收带宽(反射率小于-10.0 dB)为18.0 GHz,平均反射率达-34.5 dB.

Effect of Structure of Foam Absorbing Material on Electromagnetic Wave Absorption Properties

To investigate the relationship between the structure and the electromagnetic wave absorption properties of the absorbing material, the inorganic foam absorbing material was used as the basic material. The effect of impedance matching on the absorption properties was studied by multi-layer composite structure. When the material was two-layer composite structure of"transparent layer/absorption layer",the reflectivity of material presented as below -10.0 dB in the band of 2.0 -18.0 GHz,and the maximum attenuation loss peak was -21.5 dB at 12.7 GHz. The effect of the material surface structure on the absorption properties was studied by the treatments of pyramid structure and cone structure. Results show that the surface treatment can significantly improve the material absorption properties, furthermore, the absorption properties of pyramid strucure is better than that of the cone structure. The effective absorbing bandwidth (R< -10.0 dB) of the pyramid structure with an array of 5×5 is 15.3 GHz,and the minimum reflectivity is -43.4 dB at 9.4 GHz. Also,the effective absorbing bandwidth(R< -10.0 dB) of the pyramid structure with an array of 8 × 8 is 18 GHz,and the average reflectivity is -34.5 dB.