ansoft designer coax port feed

I joined this forum today, and am new to this field so my question may not be new. I have been trying to simulate a meander microstrip dipole using Ansoft Designer but with a coaxial feed. The software does not let me indtroduce a port without a ground plane. Can anybody help me

Thanks

Try to disign a real coax feed, not just lumped (or wave) port. Search old topics to find how to do it!

Thanks, I appreciate it!