偏置反射面天线的机电耦合建模与分析

随着偏置反射面天线向高频段、低副瓣以及轻重量的方向发展，对其结构设计和制造工艺提出了更高的要求,因此，需要研究偏置反射面天线的机电耦合问题，找出影响天线电性能的主要结构因素，从而有效降低对结构设计与加工精度的要求，进而降低成本。应用口径场法，考虑反射面表面误差和馈源误差等结构因素，建立了偏置反射面天线的机电耦合模型。通过对太阳辐射下某2.6m星载偏置反射面天线的机电耦合分析结果与电磁分析软件FEKO的仿真结果进行对比，证明了所提方法的准确性和有效性。

Electromechanical coupling modeling and analysis of offset reflector antenna

With the development of offset reflector antenna with high performance, the growing demands for high frequency, low sidelobe level and reduced mass have brought structural design and manufacturing process stringent requirements. The electromechanical coupling problem of offset reflector antenna is studied to find out the prime structural factors which have a great effect on electromagnetic performances, reducing the requirements of structural design and machining precision effectively to decrease the cost. Considering the structural factors such as the reflector surface errors and the feed errors, the electromechanical coupling model of the offset reflector antenna is discussed and developed by using the aperture field method. By comparing the coupling analysis results and FEKO simulation results of the electromagnetic performance of a 2.6 m spaceborne offset antenna with surface thermal distortions caused by solar radiation show the proposed coupling model is effective and of potential engineering value.