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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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karthik
 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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