some questions on CST2011 simulation of antenna

Hello,all.
I'm learning CST2011 these days, and find some questions result from unclear undersanding from online help. The main concern is the solver.

My simulation is based on PCB dipole antenna which is very simple. I found the simulation results are quite same between Transient Solver and Frequency Domain Solver. All the parameters in two solvers are by default("Adaptive mesh refinement" is not chosen) and "Hexahedral Mesh" type is chosen in frequency domain solver.

BUT,when "Adaptive mesh refinement"is chosen,the results changed large.

1)How to choose the solver types for pcb dipole simulation ,transient solver or frequency domaim solver? whicn one is better?
2)"Adaptive mesh refinement",when to choose it? choose or not,the simulation results are different very much.
3)for dipole,I use "Discrete edge port",is it OK?

I find that use "Transient solver" and choose "Adaptive mesh refinement" for dipole simulation could get the results that i need ,but i need your advice or confirmation , thank you!

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