To reduce the sidelobe level (SLL), a ten-element non-uniform microstrip array antenna at 14.25 GHz frequency was designed. This Letter proposes an improved differential evolution algorithm, expanding the optimisation variable from one, the array element spacing, to two, the array element spacing and the excitation amplitude. Then a series linear array antenna with non-uniform spacing and unequal excitation is constructed, and a uniform spacing Chebyshev array antenna and an equal excitation non-uniform spacing array antenna are constructed as references. The experimental results show an SLL of −22 dB and a gain of 16.5 dB.

中文翻译：

---

非均匀间距和激励幅度的低旁瓣串联微带阵列天线设计

为了降低旁瓣电平（SLL），设计了一种频率为 14.25 GHz 的十单元非均匀微带阵列天线。本文提出了一种改进的差分进化算法，将优化变量从一个阵元间距扩展到两个阵元间距和激励幅度。然后构造了非等距非等激励串联线阵天线，并参考构造了等距切比雪夫阵列天线和等激励非等距阵列天线。实验结果显示 -22 dB 的 SLL 和 16.5 dB 的增益。