Problems with EM-cosimulation and schematic results for CPWG structures

Hi ,
I have designed the output matching with CPWG(cpw with ground) line and L,C component.
schematic.png
EM1_2.png
EM2_2.png
EMcosim.png
But the result of EM-cosimulation looks strange and different from the result of schematic.
(S(37,37) is for schematic, S(39,39) is for EM cosimulation)
result.png

Can someone give me any advice about my layout and EM result??
Thanks~

jeff0283 on Mar 5, 2016 6:24 AM

附图/附件

EMcosim.png

EM1_2.png

EM2_2.png

schematic.png

result.png

I found the problem.
When I took away the pins on the ground of the CPWG line on my layout, and let the capacitor connected to the ideal ground, the result seems less strange, but is different from the original result.
EM1.png
EM2.png
EMcosim_2.png
result_2.png
(S(37,37) is for schematic,S(39,39) is for EM-cosim with ground pin on layout,S(41,41) is for EM-cosim without ground pin on layout.)

Does someone know if I should add the ground pin on the layout?

附图/附件

result_2.png

EM1.png

EMcosim_2.png

EM2.png

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