有限元的三角形剖分，节点标号，单元标号，很适合用于电磁场等有限元的求解-fem can use to answer EMT and so on

the code use the FEM to calculate the radar wave.and the result is a 2D graph.however,because of the secret,the other code cann't be posted,but this is the main code.

Discontinuity In a Parallel-Plate Waveguide. Dielectric rod inserted in a parallel -plate waveguide. Finite Element Method Solution (FEM)