It is well known that radome has adverse effects on the performance of the antenna array while protecting it from outside environments. In some extreme cases, e.g., when an airborne radome is ablated during the flight of a high-speed vehicle, the impaired radome will severely alter the radiation pattern (RP) of the antenna array. To counteract this effect, it is desirable that the RP of the array can be recovered to satisfy the preset criteria even in presence of the impaired radome. In this letter, we investigate the method of fast recovery of the RP of an enclosed antenna array when the dielectric radome is damaged. An improved simulated annealing algorithm is combined with the active RPs of antenna elements in the array-radome system to fast restore the RP of the array. Both the mutual coupling among array elements and the interactions between the array and impaired radome are taken into account rigorously, so the RP of the array can be restored with good accuracy. The effectiveness of the method is validated by the numerical and experimental results for the RP recovery of a real-life linear antenna array enclosed by an impaired radome.

中文翻译：

---

受损天线罩封闭天线阵列的辐射方向图恢复

众所周知，天线罩在保护天线不受外界环境影响的同时，会对天线阵列的性能产生不利影响。在一些极端情况下，例如，当机载天线罩在高速飞行器的飞行过程中被烧蚀时，受损的天线罩会严重改变天线阵列的辐射方向图（RP）。为了抵消这种影响，即使在天线罩受损的情况下，也希望能够恢复阵列的 RP 以满足预设标准。在这封信中，我们研究了在介质天线罩损坏时快速恢复封闭天线阵列 RP 的方法。改进的模拟退火算法结合阵列天线罩系统中天线单元的有源RP，快速恢复阵列RP。阵元之间的相互耦合以及阵列与受损天线罩之间的相互作用都被严格考虑，因此可以很好地恢复阵列的RP。数值和实验结果验证了该方法的有效性，该结果用于由受损天线罩包围的真实线性天线阵列的 RP 恢复。