新型顶部加载单极天线

提出了一种新型顶部加U型负载的单极天线结构，给出了设计思想和结构模型，该天线采用同轴馈电，辐射轴向笔状波束且线极化特性良好的波，在理论分析的基础上具体对其进行了仿真，并依照仿真的尺寸结果，加工实物进行了实验研究。仿真结果表明：该天线实现了同轴馈电单极天线的轴向辐射，当工作频率在4.0 GHz时，天线轴向增益为8.33 dBi，轴向轴比为－69.64 dB，反射系数为0.034；在3.83～4.5 GHz的频率范围内反射系数小于0.1。实验结果表明：该天线在中心频率时测量增益为8.116 dBi，驻波比为1.098，并且在3.75～4.50 GHz的范围内驻波比都小于1.2，可以看出仿真结果与实验结果基本一致，互相进行了验证。

Monopole antenna with top load

A new style of monopole antenna is put forward, along with the design idea and structure model. The antenna fed by a coaxial line is top-loaded with a U-type load. Simulation and experiments have been conducted. The simulated results show that this antenna can radiate axial microwaves, it’s Gain is 8.33dBi, the axial ratio is －69.64 dB, the reflectance is 0.034, in the range of 3.83 GHz to 4.50 GHz , the reflectance is below 0.10. The experimental results show that it’s gain is 8.116 dBi, the VSWR is 1.098 at 4.0G Hz, in the range of 3.75 GHz to 4.50 GHz , the VSWR is below 1.2, the results of experiment consistent with the simulated results, validated each other．