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研究了一种考虑地面影响时准确计算鱼骨天线相位中心的方法。由于相位方向图的准确计算是准确提取相位中心的前提,所以我们按照鱼骨天线的施工结构建模,并采用矩量法(MoM)进行计算,保证了相位方向图计算的准确性。地面的影响会导致主瓣上翘,为了减小相位中心计算的误差,选择包含主瓣最大辐射方向的两个正交平面内的相位方向图来进行处理。然后,采用最小二乘法计算了天线的相位中心,并验证了其准确性。最后,给出了一种鱼骨天线的相位中心位置随频率的变化曲线,结果表明该鱼骨天线的相位中心位置随着频率的变化较为明显。
A method of accurately calculating the phase center of fishbone antenna considering ground effect is studied. Because the accurate calculation of the phase pattern is the premise of accurate extraction of the phase center, we model the construction of the fish bone antenna and use the MoM method to ensure the accuracy of the phase pattern calculation. The influence of the ground will cause the main lobe upturned. To reduce the error of phase center calculation, the phase pattern in the two orthogonal planes containing the direction of maximum radiation of the main lobe is selected for processing. Then, the phase center of the antenna was calculated by the least square method and its accuracy was verified. Finally, a curve of the center position of the fishbone antenna with frequency is given. The result shows that the phase center position of the fishbone antenna changes obviously with the frequency.