基于时域有限差分法的圆极化十字振子天线设计  

Design of Circular Polarization Cross Dipole Antenna Based on FDTD

作　　者：黄炳刚[1] 项阳[2] 

机构地区：[1]西南电子电信技术研究所,成都610041 [2]解放军理工大学,南京210007

出　　处：《系统仿真学报》2009年第3期764-767,共4页Journal of System Simulation

摘　　要：通过对圆极化十字振子天线在同相馈电时中间区域电磁耦合的分析,提出了用于表征十字振子天线实现圆极化的振子等效长度缩短模型。利用时域有限差分法,设计了十字振子天线。通过仿真和优化,找到了实现圆极化的振子最佳尺寸,并研究了天线尺寸改变时,极化特性的变化规律。在一定轴比带宽条件下,优化后的十字振子天线正交方向上圆极化轴比可以达到1.023。Through the analysis of the electromagnetic coupling of the middle region of circular polarization cross dipole antenna with co-phase feeding, an equivalent shortened length model of dipole was proposed to explain how the cross dipole antenna achieves circular polarization. Then a cross dipole antenna was designed utilizing finite difference time domain method. An optimal dipole size which achieved circular polarization was found out through simulation and optimization. When the size of the antenna changing, the discipline of polarization characteristic was analyzed. Under certain axis ratio bandwidth, the circular polarization axis ratio of the optimized cross dipole antenna can reach 1.023 in orthogonal direction.

关 键 词：十字振子天线 圆极化 轴比 时域有限差分法 矩量法 

分 类 号：TN828.4[电子电信—信息与通信工程]