使用阵列馈源的大型反射面天线快速分析

Fast Analysis of Large Reflector Antenna Using Array Feed

中文关键词:  反射面天线  阵列天线  快速算法  并行计算  电大尺寸

英文关键词:reflector antenna  array antenna  fast algorithm  parallel computing  electrically large

中文摘要:

      在分析以天线阵作为馈源的大型反射面天线时,由于其电尺寸很大,难以实现全波算法的整体求解。同时天线单元通常具有复杂的结构、材料和馈电方式,若采用高频算法对其计算无法保证足够的精度。针对这一复杂电磁问题,文中首先用全波算法提取出子阵等效源,通过平移等效源的操作快速计算出阵列辐射特性。然后使用近场方式计算阵列对反射面的耦合作用并采用快速算法计算反射面。天线阵与反射面的计算均采用并行计算技术,大幅提高了计算效率。数值计算结果验证了方法的有效性,同时采用该方法高效解决了一个大型抛物柱面天线的辐射问题。

英文摘要:

      When analyzing a large reflector antenna with antenna array as its feed, it is difficult to realize the overall solution using full-wave algorithm because of its large electrical size. At the same time the antenna unit usually has complex structure, material and feeding mode, and therefore the high-frequency algorithm is unable to ensure sufficient calculation accuracy. To solve this complex electromagnetic problem, first the full wave algorithm is used to extract the subarray equivalent sources, and the radiation characteristics of the antenna array can be fast calculated by translating the equivalent sources. Then the near-field method is used to calculate the coupling effect of the antenna array on the reflector, and fast algorithm is used to calculate the reflector. Both the antenna array and the reflector are calculated using parallel computing technology, which greatly improves the computing efficiency. Numerical result verifies the effectiveness of the method. At the same time, the radiation problem of a large parabolic cylindrical antenna is effectively solved by the method.