[help]:how can i know antanna is linear or circular polariza

I use hfss simulating microstrip antenna, and i can get axial ration in post-process. how can i know antanna is linear or circular polarization? should i plot axial ratio in E-plan or H-plan to decide whether it is linear or circular polarization?
thanks in advance!
best regards!

If the A.R. is proximum to one, then Your Antenna work in circular polarization: Yes, the use of A.R. is a good Idea.