3D打印技术在机载超宽带共形天线中的应用研究

Application research on the 3D printing technology in airborne ultra-wideband conformal antenna

为提高共形相控阵天线的设计制造效率,在平面紧耦合天线的基础上,设计了与飞机襟翼曲面共形的紧耦合超宽带相控阵天线。按照共形天线的安装要求,提出了混合3D打印技术,即采用熔融堆积成型技术及微滴喷射成型技术实现襟翼流线型曲面模型的打印,并完成了紧耦合天线辐射层的打印,验证了3D打印技术在共形天线上的应用。加上馈电结构后对单元电压驻波比(voltage standing wave ratio, VSWR)和方向图进行了测试,结果表明所设计的天线在0.4~2.0 GHz范围内,VSWR、单元方向图和阵列方向图符合设计技术指标,为后续共形天线设计和加工提供了技术基础。

In order to improve the design and manufacturing efficiency of the conformal phased array antenna,a tightly coupled ultra-wideband phased array antenna is designed on the basis of the planar tightly coupled antenna,which is conformal to the surface of the aircraft flap.According to the installation requirements of the conformal antenna,a hybrid 3D printing technology is proposed,and the melt stacking molding technology and microdrop injection molding technology are used to first realize the printing of the streamlined surface model of the flap,and then complete the printing of the radiation layer of the tightly coupled antenna,which verifies the application of 3D printing technology on the conformal antenna.After adding the feed structure,the unit voltage standing wave ratio and directional map are tested,and the results show that the designed antenna has the voltage standing wave ratio,unit directional map and array directional map in the range of 0.4−2.0 GHz,which meets the design specifications and provides the technical basis for the subsequent design and processing of the conformal antenna.