动载荷对结构功能一体化天线力电性能的影响

结构功能一体化天线是将集成微带天线阵列的射频电路嵌入到武器平台结构中,它既可作为力学承载的蒙皮结构,又可作为收发电磁波的微波天线,在未来飞行器中具有巨大的应用前景。针对服役中的结构功能一体化天线力电性能演化问题,通过分析结构变形与天线电性能的影响关系,利用相位差建立动载荷作用下结构功能一体化天线的机电耦合模型,利用最小二乘支持向量回归对结构变形的数据拟合来获得结构变形下的电性能。通过研制的2.5 GHz结构功能一体化天线试验装置,验证了机电耦合模型的正确性。利用验证后的耦合模型,通过数值分析获得了动态载荷对结构功能一体化天线力电性能的影响规律,其结果表明,动态载荷下天线结构变形会影响天线的主波束方向、增益和副瓣。

Influence of Dynamic Load on the Mechanical and Electrical Performance of Structurally Integrated Antenna

Structurally integrated antenna is a kind of novel antenna which can embed RF circuit and microstrip antenna array into the structure of weapon platforms. The antenna is not only a load-bearing skin structure, but also a microwave antenna which can receive or send electromagnetic waves, and it can be applied to all kinds of new weapon platforms in the future. As for the evolving problems of the mechanical and electrical performance of structurally integrated antenna, the influence relationship between the structural deformation and the electrical performance is analyzed, and an electromechanical coupling model is developed by using the phase errors. Moreover, the deformed structure is fitted by using least square support vector regression to obtain the electrical performance. At the end, an experimental apparatus with 2.5 GHz structurally integrated antenna is developed, and some experiments from the apparatus are carried out, and the experimental results confirm the effectiveness of the electromechanical coupling model. The validated model is applied to investigate the influence mechanism of dynamic load on the mechanical and electrical performance by analyzing the obtained results. The results show that the structural deformation will affect the direction of main beam, side lobe and gain of the structurally integrated antenna.