基于多目标算法的螺旋天线小型化设计

Miniaturized Design of Archimedean Spiral Antenna Based on Multi-objective Particle Swarm Optimization

小型化设计是阿基米德螺旋天线设计的一个难点,文中基于多目标粒子群优化算法对阿基米德螺旋天线小型化设计开展了研究。设计过程中把阿基米德螺旋臂设计成曲折形式并在天线外围加载金属圆环,使天线的工作频率向低频偏移,从而达到小型化的目的。仿真结果表明:在1.72 GHz^11.2 GHz频段内回波损耗小于10 dB,1.9 GHz^12 GHz频段内轴比小于3 dB。与传统阿基米德螺旋天线相比,在保证阻抗特性和圆极化特性条件下,该天线口径面积减小了37%,达到了小型化设计的目的。

Miniaturized design of archimedean spiral antenna is a difficult problem, and the problem is researched based on multi-objective particle swarm optimization algorithm in this paper. In the process of miniaturized design, meander line and pe- ripheral metal ring are added into the antenna to decrease the frequency. The results of simulation show that the return loss is less than 10 dB in the range 1.72 GHz to 12 GHz, and the axial ratio is less than 3 dB in the range 1.9 GHz to 12 GHz. The new design antenna keeps good characteristics of impedance match and circular polarization, while its size is reduced about 37 % compared with the traditional one, which achieves the purpose of miniaturized design.