基于GA与PIM混合方法的基站天线波束赋形设计

Shaped Beam Design of Base Station Antennas Using the Hybrid Method of GA and PIM

基站天线的波束赋形设计是提高移动通信系统信道性能的关键技术之一。将投影迭代法和遗传算法应用到板状振子型基站天线的计算中,实现基站天线的快速优化设计。首先把振子形式假设为条带形状,对振子和底板均采用RWG基函数展开,得到传统矩量法的矩阵方程,然后通过投影迭代逐步修正未知电流,进而求得天线的远场方向图与天线尺寸的关系,最后与遗传算法相结合,优化设计了斜极化基站天线的波束赋形。实验结果与设计结果相吻合,证明了该方法的实用性。

The beam shaping of base station antenna is a key technology to improve the performance of mobile system channel. In this paper, based on the mobile system the projection iterative method （PIM） and Genetic Arithmetic are used to analysis base station antennas. With dipoles supposed to be strips, the whole antenna structure surface can be meshed on the basis of RWG edge elements. The impendence matrix obtained by using the method of moments is divided into a series of small sub-regions by decomposition. The surface currents of the whole antenna are computed by the PIM iterative process, and then the far field pattern is obtained. The hybrid method of Genetic Arithmetic and PIM is used to design the shaped beam of slant polarization antenna array. The measurement results are in good agreement with the design results.