Microstrip Transmission Lines using FDTD

I am new in FDTD. I am interested in evaluating Microstrip Transmission Lines using FDTD method. Are there are any source codes available for Microstrip geometries? So that i could get started.

Thank you

hi
microstrip can be modeled as ground plane with epslon is average between air and subestrate and subestrate and then epslon on inter face between subestrate and air and on top u can model microstrip line as pec and bottom as all pec
best regard