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在相控阵天线的应用中,有时需要实现左右不同的副瓣电平。为了减少计算量,我们希望能使用尽量少的参数实现对副瓣不同要求的波束赋形。本文提供一种设计方法,针对一个16单元的阵列,只对天线16个单元的幅度以及其中一个单元的相位进行优化,其15个单元的相位随扫描角度变化。通过差分进化算法的优化能迅速方便的得到所需的幅度相位值,对各个扫描角度实现不同副瓣的波束赋形,使天线在左右的副瓣电平分别为-25 dB和-35dB。
In phased array antenna applications, it is sometimes necessary to achieve different left and right sidelobe levels. In order to reduce the computational complexity, we hope to achieve the beamforming required by different sidelobes with as few parameters as possible. This article provides a design methodology for a 16-cell array that optimizes only the amplitude of the antenna’s 16 cells and the phase of one of the cells, the phase of which varies with scan angle. The optimization of the differential evolution algorithm can quickly and conveniently obtain the required amplitude and phase values, and realize the beamforming of different side lobes for each scanning angle, so that the sidelobe levels at the left and right of the antenna are -25 dB and -35 dB, respectively.