Why difference in Zo on two ports of CPW --HFSS

时间：03-22 整理：3721RD 点击：

hiall,
I simulated a CPW with HFSS and compared the results with analytical expressions. The Zo matches pretty well. BUT there is a difference in Zo on two ports i.e. if on one port it is 54.5ohms on other it is 56.0ohms...Why is this difference? kindly clarify
cv

Thats probably due to difference in mesh on both ports.
Error is around 3 percents, you dont have to be afraid about the result.
cheers

ok thanx. I am new to HFSS and RF
cv

Thats probably due to difference in mesh on both ports.
Error is around 3 percents, you dont have to be afraid about the result.
cheers

I agree with eirp. It can be improved by reducing the port size and increasing the density of the mesh. A straight forward method is to use the mean value of those two ports.

hi cvenkat, do you mind advising me on how to do the CPW simulation in HFSS? i can get the expected results. thanks

hello,
Sorry i didnt login for long time. I hope by now u mite have got an idea abt CPW design. Anyway if u still need help u can ask me . I'll try to help
sorry
cv

Guys -- It is seriously sub-optimal to do planar circuits with a volume mesher. If you use a surface meshing tool...any surface meshing tool...you will get much better results. Three percent difference in Zo is OK if you are not very critical about error. And volume meshers are great for full 3-D structures. However, any good surface mesher will give you much less than 1% error in a tiny fraction of the analysis time for nearly any planar circuit. But if you don't mind multi-percent errors and 10x longer analysis times, go ahead and keep using volume meshers on planar circuits. I mean, why use a car when a mule will do?

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