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Low S21 problem with stack patch in HFSS

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chenyiting

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I am currently designing a probe-fed stack patch for frequency band 27.5~30GHz, the structure is down below.
1658381677310.png

The gap I cut around the feeding probe on the driven patch seems to increase the BW, but will make S21 pretty awful(before cut ~-18dB)
1658381963675.png

Is there a way I can do on the current structure to make S21 lower?
The following pictures are the surface J
driven patch(top view)
1658382300081.png

driven patch(bottom view)
1658382346578.png

parasitic patch(bottom view)
1658382381022.png

antenna ground(top view)
1658382406048.png

antenna ground(bottom view)
1658382433812.png
 

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