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本文讨论斜入射情况下的微波吸收材料性能,计算结果表明:电磁波在斜入射时有一临界入射角θ_c。如果入射角θ<θ_c,则在反射方向上的反射系数或近似不变,或比垂直入射时小;如果θ>θ_c,则反射功率将随着θ的增加而变大。单层涂覆型微波吸收材料,其θ_c一般为32°左右,双层结构型的θ_c为45°左右。对于不同的极化和不同的工作频率,θ_c值也有差异。非磁性微波吸收材料,在低于吸收峰所对应频率的低频端,其θ_c为零,在高频端,随着频率的升高,θ_c也在增加。无论是平行极化,还是垂直极化,其微波吸收性能随入射角的变化规律是相似的。
In this paper, the properties of microwave absorbing materials under oblique incident conditions are discussed. The calculated results show that there is a critical incident angle θ_c of electromagnetic waves at oblique incidence. If the angle of incidence θ <θ_c, the reflection coefficient in the direction of reflection is approximately the same or smaller than that at normal incidence; if θ> θ_c, the reflected power becomes larger as θ increases. The monolayer coating type microwave absorbing material has a θ_c of about 32 ° and a θ_c of about 45 ° in the bilayer structure. The θ_c values vary for different polarizations and different operating frequencies. Non-magnetic microwave absorbing material, in the lower frequency than the absorption peak corresponding to the low-frequency, its θ_c is zero, at the high-frequency, as the frequency increases, θ_c is also increased. Whether it is parallel polarization or vertical polarization, its microwave absorption properties with the variation of incidence angle is similar.