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CPW HFSS Wave Port vs Lumped Port

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prcken

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Hi
I am currently using HFSS simulating a grounded CPW T-line on silicon substrate.
I tried with both Wave port and lumped port. But I got very different results.
I read that a lot saying that it needs to meet the minimum sizing for wave port depending on the width and spacing of the CPW parameters. I am sure my wave port size is big enough. Is there a problem that the wave port is too big?
I am so confused.
Any comments or suggestions?
Thanks!

Wave port setup: the wave port touches 1 signal terminal and 2 ground terminals, for ground, set terminal renormalization to 0.001 Ohm
FGCPW.PNG

Lumped port setup: i used PEC sheets connect two ground traces to the ground plane PEC. Air box didn't display in the picture below.
FGCPW_lumpedPort.PNG

S-parameters got form wave port, de-embedding function used.
image (4).png

Worse S-parameters got form lumped port for the same length
image (3).png

wave port field display on signal terminal (zoomed-in)
portfield.PNG
 
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