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Post subject: grounded cpw in ansoft designer
Posted: Thu May 18, 2006 9:53 pm
Joined: Tue Apr 11, 2006
Does anyone have experience working with
grounded CPW lines in ansoft designer? I was trying
to simulate a short GCPW. This is how I defined
1. I selected the edges of the
signal and the 2 ground plane lines (co-planar)
2. I placed an edge port.
I did the same
for the second port. I had a number of vias along
the length of the line. When I run the simulation,
I get warnings saying that the port impedance does
not match port calibration. Is there something wrong
in the way I have defined the port? When I look
at the results, the S-parameters have a whole bunch
of options like S(P1: -+- P1: -0-) and different
combinations of these for S11,S21,S12 and S22. When
I choose any of these, nothing plots!! I have no
clue what is going on with this. When I run the
same simulation in HFSS I get pretty good results,
though it takes quite a while. Can someone please
help me with this??