Fabrication method of cylindrical dielectric-loaded antenna by means of laser etching
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摘要: 圆柱形介质加载四臂螺旋天线因宽波束、圆极化、体积小等优点被认为是微小卫星天线的理想方案。为了解决介质加载四臂螺旋天线制作的难点，提出了一种全新的磁控溅射金属化加激光刻蚀的新工艺，采用计算机数控结合激光刻蚀的柔性加工技术，制作出3维立体的四臂螺旋结构，制备了应用于微小卫星系统的介质加载四臂螺旋天线，相对于传统工艺， 大大提高了加工精度，并缩短了加工周期。结果表明，天线的电气性能达到了设计要求，且具有良好的机械性能。该研究为以后此类曲面共形天线的制作提供了参考。Abstract: Cylindrical dielectric-loaded quadrifilar helix antenna is an ideal choice for small satellite antenna owing to its advantages of wide beam, circular polarization and small volume. In order to solve the difficulty of the manufacture of dielectric-loaded quadrifilar helix antenna, a novel manufacture method combing magnetron sputtering metallization and laser etching was introduced. Computer control system with laser etching technology was used to produce three-dimensional quadrifilar helix structure, which is suitable for small satellite systems. The novel process can greatly improve the machining accuracy and shorten the processing cycle compared with traditional process. The results show that the manufactured antenna has good electrical performance, which meets the design requirements of a small satellite system, as well as good mechanical properties. It offers a method of manufacture of the cylindrical conformal antenna.
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