大型共形天线阵列的仿真计算

Accurate Computation of Electrically Large Conformal Antenna Array

分析设计大型阵列天线阵问题时,由于计算量巨大,很难实现全波方法如矩量法的整体仿真计算。而传统的方向图乘积定理无法考虑阵列单元间的耦合作用,所以无法保证计算的精度。针对这些问题,本文通过分析阵列单元间的耦合作用,提取出考虑耦合作用的单元因子作为阵列的本征解。在提取单元因子过程中,根据单元间耦合强度自适应选取需要考虑的耦合单元数。从而实现了在精度可控的前提下选取尽量少的单元数来减少计算量。分析共形阵列时,通过选择典型单元因子,根据阵面方向及位置进行旋转平移操作后加权组合出整个阵列的方向图。最后采用该方法分析了一个大型圆柱共形阵列天线的辐射特性。

When calculating the radiation problem of electrically large conformal antennas array, it is difficult to use the full wave method, such as method of moment, since the large amount of computations.The traditional pattern multiplication method cannot take the coupling between units into account.Therefore, its accuracy is incredible in many situations.To deal with these problems, this paper extracted the unit factors with coupling by analyzing the coupling between nearby units.All the unit factors form the eigensolutions of the antenna array.During extracting the unit factor, the number of coupling units is chosen by the degree of coupling adaptively.It helps to use the least units to calculate the eigensolutions without losing accuracy.When calculating the radiation pattern of conformal array, the corresponding units are chosen and translated according to the structure of array.The radiation pattern can be obtained by weighting the eigensolutions.Finally, a cylindrical conformal antenna array is analyzed using this method.