Build and Design MICROSTRIP structure using COMSOL to able of field analysis of a damaged microstrip and resonant transmission line

I want to do build MICROSTRIP structure with FEM modeling and time domain analysis using COMSOL software. simulate it and add a discontinuity to represent physical damage and use ports at each end of the microstrip to analyse signal propagation. Also, make an analysis of a resonant transmission line such as , resonant microstrip transmission line (TL) design, finite element modelling of a resonant TL, and frequency domain analysis of a resonant TL.