电磁脉冲下螺旋天线瞬态响应的仿真研究

摘要

Since communication antennas often operate at broad-band or multi-band modes, time-domain simulation on antenna characteristics is quite necessary, for protecting communication antennas from the electromagnetic interference. It is necessary to study the situation that antennas are mounted on a PEC platform and are excited by a pulse source.This paper uses a generalized mathematical procedure, time-domain integral equation, to investigate wideband transient pulse responses of helix antenna illuminated by an EMP. At the same time, Laguerre polynomials as entire domain temporal basis are implemented to expand the time variables in the TDIE, leading to a marching-on-in-degree scheme. Numerical computations are performed to check the accuracy of the codes. The transient response characteristics of helix antenna are captured and analyzed.%由于通信天线经常工作在宽带或者多频带模式,为了对电磁干扰下的通信天线进行保护,对天线时域特性的仿真必不可少.其中一个需要研究的问题就是将天线装载于金属平台上并同时使用脉冲源激励.文中使用一种具有通用性的数值方法--时域电场积分方程,仿真了电磁脉冲照射下螺旋天线的宽带瞬态响应特性.采用拉革尔多项式作为全域时间基函数来展开时间变量,获得求解线天线散射辐射问题的时域电场积分方程,也就是阶数步进递推格式,最后使用数值计算得到了螺旋天线的瞬态响应特性.