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Grounded cpw in ansoft designer - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Below are all of the old forum threads, including all the responses to the original posts.

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 Post subject: grounded cpw in ansoft designer
Posted: Thu May 18, 2006 9:53 pm 
 
Colonel

Joined: Tue Apr 11, 2006 8:13 pm
Posts: 45
Hi,

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 the ports:

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??

Karthik.




Posted  11/12/2012

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