双锥-线栅型水平极化天线辐射特性研究

Radiation Characteristics of Biconical-Wire Grid Horizontally Polarized Antenna

从解析解和近似解的角度分析了双锥-线栅型水平极化天线的特性阻抗,运用电磁仿真软件CST MWS对该水平极化天线的辐射特性进行了计算,分析了地面反射及架设系统对辐射电场的影响,从幅值、上升时间及半高宽等方面,对半锥角、圆锥底面半径和扩展天线根数不同时的辐射电场波形进行比较。研究结果表明:扩展天线可很大程度上延续双锥天线的辐射特性;随着圆锥半锥角度数的增加,辐射场幅值变大,但场均匀性变差;双锥底面半径在选取范围内产生的辐射场波形相差不大,但随着锥底面半径的减小,电场幅值减小,波形平滑度下降;扩展天线根数过多会使距离中心位置较远的电场波形峰值变得扁平化,且有上扬趋势;架设系统对波形的主要特征无影响。

In this paper,the radiation characteristics of a biconical-wire grid horizontally polarized antenna are calculated by using the CST MWS electromagnetic simulation software,and the influences of the ground reflection and the erection system on the radiated electric field are analyzed.The waveforms of the electric field with different degrees of half cone angles,the radius of cone bottom,and the number of the extended antennas are compared in terms of amplitude,rise time,and half width,etc.The results show that the extended antenna can largely continue the radiation characteristics of the biconical antenna.With the increase of half cone angle,the amplitude of radiation field becomes larger,but the field uniformity becomes worse.The difference of the radiation field waveform generated by the radius of the biconical bottom within the selected range is small,but with the decrease of the radius of the biconical bottom,the electric field amplitude decreases and the waveform smoothness decreases.If the number of expansion antennas is too large,the peak value of electric field waveform far from the center will become flat and tend to rise.The erection system has no effect on the main characteristics of the waveform.