基于传输线理论分析给出了TEM喇叭在高斯脉冲激励下的响应方程，并采用数值计算方法，从响应波形的下降沿拖尾振荡相对基线的浮动量和负峰下冲量的角度研究了在高斯脉冲及其微分形式脉冲激励下，TEM喇叭的响应特性与其张角的依赖关系。基于以单锥TEM室为核心的时域测试系统，实验研究了TEM喇叭的短电磁脉冲响应特性随张角的变化关系，结果表明：对于底宽1 ns微分高斯脉冲，随着张角从8°增大至20°，TEM喇叭响应波形的负峰下冲量由约1.0%增大到约3.6%，实验结果与理论分析和数值计算结果一致。

The paper analyzes the response equation of TEM horn to Gaussian pulse based on the theory of transmission line. The dependence of TEM horn’s response on its open angle is numerically studied under the excitation of Gaussian pulse and its differential, respectively, according to the tail fluctuation and negative peak undershoot in response. The experiments are conducted based on the time-domain test system with cone TEM cell. The results show that, for differential Gaussian pulse of 1 ns bottom-width, the negative peak undershoot increases from 1.0% to 3.6%, as the open angle varies from 8° to 20°. The experimental results are consistent with theoretical analysis and numerical simulation.