中文说明：应用背景时域有限差分方法（FDTD）是由有限差分法发展出来的直接由麦克斯韦方程 对电磁场进行计算机模拟的数值分析方法， 近年来时域有限差分法迅速地在电磁 工程领域的各个方面得到了广泛的应用和发展。本文即采用 FDTD 方法对微带缝 隙耦合天线进行仿真。 关键技术用 Matlab 对已知模型尺寸大小的微带 缝隙耦合天线进行 FDTD 编程计算。在得到较好的仿真结果的前提下实现 Matlab 的图形用户编程，即 Matlab GUI。在此界面上可以输入三种不同激励源，可以 观测不同表面的电磁场值的变化动画，并且可以通过进度条随时知晓程序的进 程。在程序运行完毕后可以得到输入波的波形及频谱，输出波形的波形及频谱， 以及 S11 曲线。
English Description：
Application backgroundTime domain finite difference method (FDTD) is developed by the finite difference method directly from the Maxwell equationThe numerical analysis method for the computer simulation of electromagnetic field is presented. The finite difference time domain method is rapidly in electromagnetic field in recent years.All aspects of engineering field have been widely used and developed. In this paper, the FDTD method is used to microstrip slotSimulation of gap coupled antenna.Key TechnologyUsing Matlab to model the size of a microstripFDTD programming calculation of gap coupled antenna. In the premise of the better simulation results MatlabGraphic user programming, that is, GUI Matlab. On this interface can enter three different excitation sources, canObserve the changes of the electromagnetic field of different surfaces, and can be known by the progress bar at any time.Cheng. After the operation of the program can be obtained f