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为优化得到给定形状的目标方向图,引入了一种基于DFP-BFGS无约束最优化算法的数值方法。优化过程是先对阵列各单元的激励幅度和相位同时优化,然后对得到的阵列激励幅度数据进行部分调整,使其更加均匀以便于馈电网络的设计。最后固定激励幅度分布,仅对相位数据进行优化。在实现对方向图主瓣波束赋形的同时,得到了较为均匀的激励幅度分布。该优化方法具有应用灵活和结果可调控的优点,是一种实现阵列天线波束赋形的实用方法。
In order to optimize the target pattern for a given shape, a numerical method based on the DFP-BFGS unconstrained optimization algorithm is introduced. In the optimization process, the excitation amplitude and phase of each unit of the array are optimized at the same time, and then the obtained array excitation amplitude data is partially adjusted to make it more uniform for the design of the feed network. Finally, the excitation amplitude distribution is fixed, and only the phase data is optimized. In the same time, beamforming of the main lobe of the pattern is achieved, and a more uniform excitation amplitude distribution is obtained. The optimization method has the advantages of flexible application and adjustable result, and is a practical method for implementing beamforming of an array antenna.