基于SLM成形的四臂螺旋天线制造及性能分析

Fabrication and Performance Analysis of Quadrifilar Helix Antenna Using Selective Laser Melting Technology

为实现四臂螺旋天线的低成本、快速制造,文中采用选区激光熔化(Selective Laser Melting, SLM)一体化制造成形方法,开展了四臂螺旋天线一体化制造及性能分析。为分析SLM技术成形精度对天线性能的影响,分别制备了基于SLM技术一体化成形和进行线切割后处理的四臂螺旋天线。实验结果证明,采用SLM技术一体化成形四臂螺旋天线在1.561 GHz和1.575 GHz频点处的驻波比分别为1.17和1.14,俯仰角为0°时增益值达到5.2 dB和5.0 dB,在±45°俯仰角内增益值分别高于2.8 dB和1.9 d B,在±70°俯仰角内增益值分别高于-1.1 d B和-0.8 d B,满足导航天线的使用要求。通过线切割后处理优化巴伦缝隙宽度,驻波比提升了0.02,增益平均提升了0.5 dB,证明后处理SLM成形天线可以提升其综合性能。研究表明,采用SLM技术一体化成形四臂螺旋天线,在满足性能要求的基础上,在生产成本、加工周期等方面极具优势,在导航应用领域具有较大的潜力。

In order to meet the requirements of low-cost and rapid manufacturing of quadrifilar helix antenna,the integrated manufacturing and performance analysis of quadrifilar helix antenna based on selective laser melting(SLM) technology are carried out in this paper. In order to analyze the influence of SLM forming accuracy on antenna performance, quadrifilar helix antennas based on SLM technology integrated forming and wire cutting post-processing are prepared respectively. The test results show that the voltage standing wave ratio(VSWR) of the integrated quadrifilar helix antenna formed by SLM technology is 1.17 and 1.14 at the frequency points of 1.561 GHz and 1.575 GHz respectively, the gain reaches 5.2 d B and 5.0 d B at 0°, the gain within ±45°is higher than 2.8 d B and 1.9 dB respectively, and the gain within ±70°is higher than-1.1 d B and-0.8 dB respectively, which meets the requirements of navigation antenna. After the balun slot width is optimized through wire cutting post-processing, VSWR is increased by 0.02 and the average gain is increased by 0.5 dB, which shows that the comprehensive performance of the antenna can be improved through postprocessing. The research shows that the integrated forming of quadrifilar helix antenna by SLM technology not only can meet the performance requirements but also has great advantages in production cost and processing cycle. Therefore, it has great potential in navigation.