针对恒阻抗TEM喇叭的上下面板电流分布不对称，采用小反射理论和阻抗渐变思想并通过设计脊结构对恒阻抗TEM喇叭进行了改进，研制了加脊TEM喇叭。仿真及实验研究结果表明：对于脉冲宽度约为1 ns的高斯脉冲，通过加脊在一定程度上改善了恒阻抗TEM喇叭上下面板电流分布的不对称性和E面辐射电场的不对称性；相对于相同口径的恒阻抗TEM喇叭，加脊TEM喇叭作为辐射天线和反射面脉冲天线馈源时系统的主轴远场辐射因子均有提高。

An exponential impedance matching method is used to optimize the structure of constant impedance TEM horn used in ultra-wide spectrum radiation system. Both the constant impedance TEM horn and the ridged TEM horn have been fabricated and tested under Gaussian pulses of about 1 ns duration. The simulation and experiment results indicate that the radiation factor on the principal axis has been improved by the introduction of ridge. When the reflector impulse radiation antenna (IRA) is fed by a ridged TEM horn, the distribution of the electric field’s peak intensity on the reflector is intensified, and the symmetry of electric field on the reflector and the radiation factor of the reflector IRA are improved.