why inconsistent result of HFSS simulation and fomula calcul
时间：03-25
整理：3721RD
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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
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