Set port for a single transmission line in HFSS

Hi~

I am confused with setting port for a single transmission line.

I think I should choose lumped port. I just follow the steps when assigning a port to a feedline to an antenna. But how large should my port be? I saw some examples, some of them set the width of the port same as the TL, while some set the width higher than TL. Which I should choose?

thanks!