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why inconsistent result of HFSS simulation and fomula calcul

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lydu

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hi,

I simulated the simple micraostrip trace on PCB with hfss 9.2

PCB :10mm X 5mm thickness:0.175mm
Trace: 0.2mm/0.3mm/0.4mm

fomula calculation Trace impedance respective: 60.82/49.56/42.01 ohm,corresponding to 50 ohm system VWSR should be: 1.22 /1.009/ 1.19
but hfss simulation VWSR is :1.45/1.10/1.60

Who can tell me the reason?

thanks!

lydu
 

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