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本文从严格的场匹配方法出发,对电磁波在矩形截面光栅上的反射和衍射进行了理论研究。对这种光栅作为频率扫描天线的计算显示出,不论满足或不满足布喇格条件,在较宽的角度范围内入射,经调节槽宽和槽深都可获得理想的耀射。对于不满足布喇格条件,在两个互易角中较大的一个入射时,-1次衍射波有较高的效率和较宽的频带。而对这种光栅作为奥罗管中反射镜的特性的理论计算指出,它具有极宽的频带。同时本文还给出了不同频率平面波垂直入射时的等效光栅位置,以及电磁波在光栅表面反射时所引起的相位改变。
Based on the strict field matching method, this paper studies the reflection and diffraction of electromagnetic waves on a rectangular cross-section grating. Calculations of such a grating as a frequency sweep antenna show that, regardless of whether or not the Bragg condition is satisfied or not, a wide range of angles of incidence occurs, and the desired groove width and groove depth result in the desired shine. The first-order diffracted waves have a higher efficiency and a wider frequency band for the case that the larger one of the two reciprocity angles is not satisfied for the Bragg condition. The theoretical calculation of the characteristics of this grating as a mirror in the tube shows that it has a very wide frequency band. At the same time, this paper also gives the equivalent grating position when the plane waves of different frequencies are perpendicularly incident, and the phase change caused when the electromagnetic wave is reflected by the grating surface.