基于小阵计算大阵辐射场的方法研究

Research on Radiation Field of Large Array Antenna Based on the Small Array Antenna

针对受计算机资源限制导致大阵辐射场难以计算的问题,主要介绍了阵列天线远场辐射方向图的计算方法。依据小阵的基本思想,可以等效计算大型阵列天线的电流分布,从而快速准确地计算出了大型线阵和面阵的辐射方向图。用二元阵互阻抗填充远距离的互阻抗,得到的大型阵列天线的阻抗矩阵来计算天线阵的辐射场,在此计算时需要选取合适的小阵阵元,使传统的阻抗矩阵外推法计算得到的辐射场更精确,最后得到的辐射场比较接近仿真值。

In view of the limited computer resources, the large array antenna radiation field is hard to calculate.This paper mainly introduced the two calculation problems of array antenna far-field radiation pattern, considering the mutual coupling of the array cell.Current distribution of large antenna arrays is calculated using the small array, and it can accurately calculate the radiation patterns of large linear array fast.Use the mutual impedance of array antenna to fill long-distance mutual impedance, getting the large array antenna impedance matrix to calculate the radiation field of antenna array.Proper small array cells are needed when calculating, it can make the traditional impedance matrix extrapolation method more precise, the final results is close to the simulation value.