直线终端金属细线天线特性的数值及实验分析

Numerical and Experimental Analysis of Linear-End Metallic Thin Wire Antennas

该文对一种直线终端金属线状结构的天线相关特性进行了分析,对天线在自由空间的辐射特性、辐射有效区以及电压驻波比(VSWR)用时域有限差分方法(FDTD)进行了分析,同时进行实际测试;研究了终端阻抗、介质介电常数、天线张角和距地面高度的变化对天线特性的影响,对在不同调制频率下的近场分布特性进行了仿真。结果表明,仿真和测试结果基本一致,该种类型天线比常规bow-tie天线对测试环境变化的适应能力更强。

In this paper, a kind of linear-end metallic thin wire antenna is studied. The properties of the transmitted waveforms in free space, the footprints and the VSWR are simulated with the FDTD method and tested. Simulations are carried out for various parameters such as end resistor values, permittivity values, flare angles, and height above the ground. The electronic field distributions in near field are simulated in different modulated frequencies. The results show that the simulation results and the measurement results are basic agreement. The results also show that this kind of antenna is more adaptive to the different working conditions than the common bow-tie antenna.