毫米波Rotman透镜天线制造技术

Manufacturing Process of a Millimeter-wave Rotman Lens Antenna

Rotman透镜天线是某毫米波二维相控阵雷达关键部件,其波导腔多、精度高达±0.02mm,层壁薄至1mm、空腔面积比高达70%,零件加工困难且焊接成品率低。从优化天线工艺性设计入手,综合应用真空吸附装夹技术、高速铣加工技术、精密焊接组装技术,突破微变形焊接装夹技术,并通过优化数控加工程序和规范焊接工艺流程,保证了天线高精度加工和微变形精密焊接,天线波束指向和插损等关键指标一致性好,实现了天线的高战技术要求。

Rotman lens antenna （RLA） is a key component of a two-dimensional phased array radar. The RLA has many waveguide cavities with the precision up to ± 0.02 mm and the wall thickness thin to 1 man, and the area ratio of the cavities is up to 70%. As a resuk, the RLA is difficult to manufacture, with a low rate of well weld products. To optimize the antenna manufacturing process, this study integrated the applications of vacuum adsorption loaded clip technology, high-speed milling processing technology, and precise welding assembled tech- nology. Based on the optimized process, it broke through micro-deformation welding loaded clip technology. Also, the NC processing pro- gram was optimized and the welding process was standardized, to grantee the machining process of high precision and the welding process of micro-deformation. These processing measures achieved the high technical request of the P,,LA, and the key indexes of the antenna （i.e. beam- steering accuracy and insertion loss） showed good consistency.