金属桁架式天线罩结构变形对系统电性能的影响

Electrical Performance Analysis of Metal Space Frame Radome with Structural Deformation

针对金属桁架式天线罩在载荷下的结构变形对系统电性能影响的问题,分析天线罩在载荷作用下的变形,针对变形的蒙皮和桁架,将天线电磁波透过蒙皮后的透射场与桁架产生的散射场相叠加,得到变形罩体下的天线远场,在此基础上分析变形天线罩对系统电性能的影响。通过某20 m金属桁架式天线罩进行数值仿真,结果表明变形对系统电性能的影响显著,且罩体的厚度越大、频率越高,变形引入的影响越大,在此基础上分析天线罩结构变形对系统电性能的影响机理,指出较大变形下系统电性能没有剧烈变化的原因,并提出可以真实反映电性能变化程度的天线罩变形描述方法。

The effect of structural deformation on the electrical performance of metal space frame （MSF） radome is studied. The structural deformation of the radome under the impact of external loads is analyzed. The far field of antenna is obtained by adding the far field transmitted through skin to the scattering field generated by frame. The effect of the deformed radome on electrical performance is analyzed. The simulation results of some 20 m MSF radome indicate that structural deformation can degrade the electrical performance, and the degradations increase with the radome depth and the working frequency. The influence mechanism of structural deformation of radome on electrical performance is studied and the reason why a large deformation does not degrade the electrical performance greatly is given. A novel method for describing the deformation is presented to accurately estimate the effect of structural deformation on electrical performance.