基于卷边结构的小型化三反射镜紧缩场设计

为了解决毫米波太赫兹小口径反射面紧缩场天线测量系统中电磁波边缘衍射对静区的影响和系统低交叉极化隔离度问题，提出了主镜加卷边的小型化三反射镜紧缩场设计方案。采用三个反射面结构配置改善系统交叉极化隔离度，由期望的出射近场分布函数调控静区宽度，采用增大馈源边缘锥度和添加卷边的方法实现降低幅值、相位抖动的目的。此外，在卷边设计中引入了坐标转换矩阵的方法，简化了设计流程。仿真结果表明, 采用所提基于卷边结构的小型化三反射镜紧缩场设计方案, 系统取得了较好的静区性能。

Design of Miniaturized Tri-Reflector Compact Antenna Test Range Based on Rolled Edges Structure

To reduce the influence of electromagnetic wave edge diffraction on the quiet zone of the small-aperture reflector compact antenna test range system, and solve the system’s low cross-polarizationisolation issue in the millimeter-wave and terahertz frequency bands, a design scheme of miniaturized tri-reflector compact antenna test range, whose main mirror processed by rolled edges, is proposed. Threereflector structure configuration is adopted to improve the system’s cross-polarization isolation, and thewidth of the quiet zone is adjusted by the expected exit near-field intensity distribution function.Meanwhile, the method of increasing feed edge taper and adding rolled edges are adopted to achieve thepurpose of smaller amplitude and phase ripples. In addition, the method of coordinate transformationmatrix is also introduced to simplify the design process of the rolled edges. The simulation results showthat the compact antenna test range system can achieve better quiet zone performance by adopting theproposed miniaturized tri-reflector design scheme based on rolled edges structure.