My reserch work about dielectric fill in rectangula ? (CST)

Hi all friend,
Due to i have the dielectric fill in the rectangular WG simulation and have query to prove that the simulation is true by export data and manual plot.I have many query as below?
1. How to know E-field incident of the waveguide ?
2. I have run on Transient solve Is it have the time involve in the wave equeation ?

Thanks and Best Regards,
VINCENT113:D