曲面双层带通频率选择表面天线罩设计

针对复杂曲面外形严重影响频率选择表面（ FSS)天线罩传输特性的问题，提出了一种基于表面寻迹技术的曲面FSS天线罩设计方法。首先通过平面网格剖分对曲面进行拟合及表征，然后采用表面寻迹算法对FSS阵列的排布位置进行计算，最后将平面FSS结构投影于曲面外形，从而提高了曲面FSS阵列的排布及建模精度。采用该方法完成了某K频段A夹层曲面FSS天线罩的设计及测试，结果表明该曲面FSS罩的传输特性与平面FSS基本一致，且对天线辐射方向图影响较小，有效消除了复杂曲面外形对天线罩传输特性的影响。

Design of a curved radome with double-layer band-pass frequency selective surface

For the problem that the complex curved profile seriously affects the transmission properties of frequency selective surface(FSS) radome,a design method based on path tracing technique is proposed. First,the method uses plane mesh to fit and characterize the curved surface. Then,it uses the path tracing algorithm to calculate the arrangement of FSS. Finally,the plane FSS structure is projected on the curved surface. So the arrangement and modeling of curved FSS are more accurate. The design method is applied to design a K band A-sandwich curved FSS radome,and the fabricated radome is tested and verified. The results indicate that the transmission properties of the curved FSS radome agree well with those of the plane structure,and the antenna radiation pattern is less affected,so the effect of the complex curved profile is eliminated effectively.