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本文用时域有限差分（ＦＤＴＤ）法分析缝隙渐变天线，分析中对天线缝隙边缘场和薄天线衬底采取了特殊的处理方法，求天线的远区辐射场采用了ＦＤＴＤ中近场到远场的变换方法．本文计算出的缝隙渐变天线的辐射方向图和远区辐射场与实验结果比较一致，本文给出了超短电磁脉冲在天线上传播和辐射过程的瞬态直观图象，同时还研究了这种天线衬底厚度、几何尺寸及介电常数对其辐射特性及频带的影响．
In this paper, the FDTD method is used to analyze the slot gradient antenna. In the analysis, a special processing method is applied to the antenna slot fringe field and the thin antenna substrate. The far-field radiation field of the antenna is determined by using FDTD in near-field to far-field Transformation method. The radiation pattern and the far-field radiation field of the slit gradiometer antenna calculated in this paper are in good agreement with the experimental results. In this paper, the transient and visual images of the propagation and radiation of the ultrashort electromagnetic pulse on the antenna are given. Effect of Antenna Thickness, Geometrical Size and Dielectric Constant on Its Radiation Characteristics and Frequency Band.