平板裂缝天线热加工误差数值仿真及其对天线电性能的影响

基于学科交叉,文中研究了热加工对平板裂缝天线电性能的影响问题。首先,应用热弹塑性理论和生死单元技术,模拟了降温曲线、焊料及工装方式3种不同因素对天线残余应力、变形的影响。然后,文中提出了结构位移场与电磁场的场耦合理论模型,研究了热加工误差对天线电性能(增益、副瓣电平等)的影响。最后,将理论与方法应用于某机载平板裂缝天线的实际工程中,取得了较为满意的结果。

Numerical Simual tion of Manufacturing Errors from Braze Welding for Planar Slotted Waveguide Antennas and Its Effects on Antenna Electromagnetic Performance

The effect of braze welding on the electromagnetic performance of planar slotted waveguide antennas is studied based on inter-disciplinarity. Firstly, according to thermal elastic-plastic theory and birth-death tech- nique, the impact of three factors including cooling curve, solder and clamping method on the antenna＇s residual stress and deformation is simulated. Secondly, on the basis of fields coupled mathematical model between structural displacement field and electromagnetic field, the influence of manufacturing errors from braze welding on the antenna＇s electromagnetic performance （gain, side lobes, etc. ） is explored. Finally, the theory and method are applied to an airborne planar slotted waveguide antenna, some satisfactory results are obtained.