The post processor has about a dozen choices for different polarizations. You need to decide what you want by co and cross polarization then select the appropriate output.
This reference will provide more than you could ever want to know about polarization:
Warren L. Stutzman, Polarization in Electromagnetic Systems, Artech House, Inc., 1993.
There is additional help in the on-line documentation or in the IEEE, particularly in MTT or TAP
Hi, i am not so sure that my way is correct, my senior taught me the way.
HFSS>Results>Create Report>Far Field,Rectangular Plot....Solution (Setup1:Sweep1), Y(Gain,click GainL3X>dB and click GainL3Y>dB)...Under Sweeps, please choose the frequency you want under FREQ
Hope it can help. If i am wrong, please show me right way too. Thanks