一种电磁脉冲测量超宽带大功率TEM喇叭天线

An ultra-wideband high-power TEM horn antenna for electromagnetic pulse measurement

设计并加工测试了一款适用于瞬时大功率电磁脉冲测量的超宽带TEM波喇叭天线。该天线的馈电部分采用同轴宽带巴伦，辐射单元由两片平滑、渐变的金属曲面组成。为了实现天线的超宽带特性，同轴巴伦和辐射单元均采用指数渐变的形式。而为了提高天线的功率容量，将大功率同轴宽带巴伦和辐射单元直接相连。仿真和实测结果表明该天线在0．5～6GHz频率范围内，其电压驻波比VSWR≤2，平均增益Gain≥8dB，增益平坦性在±1dB之内．满足电磁脉冲测量的基本需求。

An ultra-wideband high-power TEM horn antenna for electromagnetic pulse measurement is designed and measured. The feed line of the antenna is made of coaxial ultra-wideband balun. The radiation u- nits are composed of two smooth and graded metal surfaces. In order to achieve the ultra-wideband characteristics, the balun and radiation units are used in the form of exponential gradient. Meanwhile, the antenna is fed by coaxial ultra-wideband balun directly to improve the power capacity. Measured results show that the VSWR of the antenna is less than 2 with bandwidth of 0. 5 - 6GHz, and its average gain is higher by 8 dB over the same band. Moreover, the gain flatness is in -＋ 1 dB.