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在轮廓尺寸确定的情况下,天线罩金属骨架的结构划分对其电磁性能起着至关重要的作用。从骨架拓扑结构的角度出发,研究了不同结构对骨架散射特性的影响。通过构建物理参数一致的规则和非规则金属骨架,采用感应电流率理论得出骨架不同位置的感应电流分布,最后确定骨架的扩散场影响。结果表明,非规则划分的金属骨架,由于桁杆在球面上近似为随机分布,远区散射能量被分配到了偏离主辐射方向的旁瓣区域,主辐射方向相对于规则骨架的影响要小很多。应用非规则划分方法设计的骨架,可以有效提高天线罩的性能。
In the case of the contour size determination, the structural division of the radome metal skeleton plays a crucial role in its electromagnetic performance. From the perspective of the skeleton topology, the influence of different structures on the scattering characteristics of the skeleton has been studied. By constructing regular and irregular metal skeletons with uniform physical parameters, the induced current distribution at different positions of the skeleton is obtained by using the induced current rate theory, and finally the influence of the diffusion field of the skeleton is confirmed. The results show that due to the random distribution of the spars on the spherical surface, the scattered energy in the far field is distributed to the sidelobe region deviating from the main radiation direction, and the influence of the main radiation direction relative to the regular skeleton is much smaller. The use of non-regular partition design of the skeleton, can effectively improve the performance of the radome.