超宽带TEM天线的数值模拟

Numerical simulations of ultrawide band TEM antennas

用数值方法研究了超宽带电磁脉冲源经同轴型传输线输出到 TEM天线上的发射问题。 TEM喇叭天线的前端是平行板传输线。用时域有限差分方法模拟了超宽带电磁脉冲在平行板传输线和 TEM波喇叭中的传输 ,给出了天线的输入阻抗和电压驻波比随频率的变化关系、天线的辐射场分布以及天线辐射的能量方向图等。

This paper presents numerical ly the radiation processes of the ultrawide band electromagnetic pulse emi tted from the TEM antenna fed through the coaxial transmission line. The front end of the TEM horn antenna is a parallel plate transmission line. The finite difference time domain method is adopted t o simulate the processes of transmission in the parallel plate transmission line and TEM horn. For the TEM horn, this paper presents the input impedance and voltage standing wave ratio as a function of frequencies. The radiated field dis tribution and energy pattern are also provided.