Leakage at the end of scattered field in total field-scattered field of FDTD

[s_hy]

hi all,

I have simulate 2d fdtd with total field scattered field + PML, but I have detected some serious leakage at the end of scattered field where i=ilast, j=jlast. Can anyone explain to me why is this happened?

 

[wavenology]

The way you describe your problem is very vague, what do you mean "leakage" and "at the end of scattered field"?
Is your scatterer a PEC or dielectric square? What is the size of scatterrer compared with wavelength? What is the incident angle of your planewave? This is something we talk about scattering.