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CP Antenna, How?

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huytergan

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I fed my patch antenna with coax probe at two different points like given in the pic. So I expected CP because they're 90 degrees out of. However, I don't know why but I get axial ratio level at around 20 dB. To verify, I deleted port1 and simulated with only port2, and then deleted port2 and simulated with only port1, they were same results regarding S11 and radiation pattern. So horizontal and vertical patterns are same as expected. But once again I say I couldn't figure out what's wrong to not able to get AR <3 dB.
For any help, I appreciate in advance.
teh.JPG
 

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