一个2D的FDTD模拟算例，包括完整的定义、初始化、更新方程、显示和FDTD迭代文件。该算例适合初学FDTD的人员掌握完整流程。-A 2D FDTD simulation examples, including a complete definition, initialization, update equations, display and FDTD iteration file. This example is suitable for beginners FDTD personnel