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本文对非正弦电流激励的行波天线和偶极天线的辐射特性进行了理论分析。首先导出了电流跃变沿线行进时的远区辐射波形的解析表达式,给出了行波天线平均功率方向图函数,讨论了波形控制和辐射效率等问题,然后利用行波电流跃变辐射特性的结论,给出了偶极天线脉冲响应的时域分析方法。通过一个实际例子的分析,与相应的频域分析结果和实验数据比较,在不同辐射方向均获得圆满的一致。本文还指出并纠正了文献[9]分析过程中的若干错误,消除了该文献中无法解释的疑问。
In this paper, the radiation characteristics of traveling wave and dipole antennas excited by non-sinusoidal current are analyzed theoretically. Firstly, the analytical expressions of the far-field radiation waveform when the current jumps along the line are derived. The average power pattern functions of the traveling-wave antenna are given. The problems of waveform control and radiation efficiency are discussed. Then, The time domain analysis method of dipole antenna impulse response is given. Through the analysis of a practical example, compared with the corresponding frequency domain analysis results and experimental data, we obtained a complete agreement in different radiation directions. The paper also points out and rectifies some of the errors in the analysis of [9] and eliminates the unexplained doubts in the literature.