【作者】 杨靖； 浦实； 武汉；

【机构】 武汉理工大学；

【摘要】 有学者从运动电荷的角度对偶极天线辐射脉冲电磁波的物理过程做出了详尽的分析,另给出等效电路的时域求解方法与过程。本文在此基础上,运用Altair公司FEKO软件的时域求解器进行仿真,仍以线天线为基本辐射单元,以不同时域脉冲信号作为激励源,通过观察以天线相位中心为参考点时位于空间不同方向角上不同远场点输出的时域波形,重点研究天线结构本身对于各种时域脉冲信号的作用效应,以期从物理机理上进一步解释脉冲天线的辐射机理。初步研究结果表明,线天线结构对于高斯脉冲激励源具有微分作用,并从而在观察点输出波形上产生不同程度的拖尾效应。未来,我们计划采用在天线上进行阻性加载的方法来实现对于信号拖尾效应的抑制或控制作用。更多还原

【Abstract】 A scholar had made a detailed analysis of the process of impulse signal radiating by dipole antenna from the view of accelerating charges, and given the solution of equivalent circuit in time domain. Based on it, Simulation using FEKO time domain solver,we still use wire antenna as the fundamental radiating element, excited by different time domain impulse signal. With the antenna phase center as a reference point, by observing the waveform of different farfield point in different angle, our attention is put on the effect of the structure of wire antenna on various time domain impulse signals, which aims to explain the radiation mechanism of pulse antenna in physical aspect. The result shows that the wire antenna has a differential action on the Gauss pulse excitation source, and has smearing effect on the output waveform. In the future, the method of loading resistor on the antenna will be used to realize the suppression or control of smearing effect.更多还原