GPOF在FDTD近远场外推中的应用及编程实现*

该文针对FDTD近远场外推中时域解收敛慢和运算量大等问题,改进了FDTD求解方向图的方法.其核心思想是:FDTD近场计算时,只计算前一段时间外推面上的数据,利用GPOF法估算后面时间的数据.在计算过程中,利用奈奎斯特原理,减少了时间和空间上的采样点数,大大节省了运算时间.最后将数值结果与商业软件FEKO与HFSS的结果进行比较,验证了算法的有效性.

Application of GPOF Method in NFFF Extrapolation Algorithm of FDTD and its Programming

Aiming at the problems that the time domain near field to far field (TD-NFFF) transformation using FDTD will encount of large qualities of calculation and slow convergence rate, a new algorithm to calculate the far field pattern based on FDTD is presented. The core concept is that according to the truncated time domain signal in FDTD simulations,the generalized pencil-of-function (GPOF) method is used to extrapolate the remaining part of the signal without further FDTD execution. This approach reduces the sampling number on time domain and space according to Nyquist sampling theory which is much faster. The algorithm in this paper is effective by comparing numerical result with commercial software FEKO and HFSS results.