基于多目标粒子群算法的小型化槽螺旋天线研究

摘要

Aminiaturized slot spiral antenna was designed. Firstly, a slot was opened in ordinary slot spiral antenna arms, then 6 patch resistors were loaded on the end of antenna arms. The slot position and resistances were optimized by using MOPSO(multi-objectives with particle swarm optimization) algorithm to let the operating frequency of the antenna to offset toward the low frequency, and to ensure this antenna possessed good characteristics of circularly polarized radiation. Simulating results show that the return loss of the antenna is less than –10 dB from 0.44 GHz to 18.00 GHz, and the axial ratio is less than 3 dB from 1.8 GHz to 18.0 GHz. Compared with the ordinary spiral antenna in the same size, the radiation characteristics of the antenna are greatly improved at low frequency.%设计了一种小型化的槽螺旋天线。首先在普通的槽螺旋天线臂上开槽，再在天线最外圈的天线臂上加载6个等距分布的贴片电阻，基于多目标粒子群算法对开槽位置和贴片电阻阻值进行优化，使得天线的工作频率向低频偏移，同时保证具有良好的圆极化辐射特性。仿真结果表明：在0.44~18.00 GHz频段内回波损耗小于–10 dB，1.8~18.0 GHz频段内轴比小于3 dB。与普通的螺旋天线相比，在天线口径不变的情况下，极大地改善了天线的低频端的辐射特性。