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Local warning on coupled microstrip.

Question asked by twilke on Jan 12, 2005
Latest reply on Feb 2, 2005 by JERRY_MARKETOS

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Hello,

I am using the coupled microstrip model MCN4A. With the following values.

W1=100mil
W2=17mil
S1=20mil
L=500mil
H=60mil
Metal Thickness= 2.84mil

I get this "Local Warning"

MLI Model:For best accuracy, metal thickness should be less than line width. Current values: T=0.072136mm, W=0.02159.

My metal thickness=2.84mil and my line widths are 100mil and 17mil.

Why am I getting this warning? Can I believe my simulation results?

Tony

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JERRY_MARKETOS Jan 13, 2005 1:44 AM
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I suspect the issue may have something to do with units settings in the workspace. Feel free to send the workspace to support@eagleware.com and someone will gladly review & comment.
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SLO_001 Jan 13, 2005 6:36 AM
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I tried the MCN4A elelment and I am getting the same error message. Seems to be related to the ratio of values of W1 and W2. If the ratio goes above ~5, the error message pops up. Ratio required to "trip" the error message goes up with wider tracks.
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twilke Jan 28, 2005 10:29 AM
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Sent in the workspace file.

Tony
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JERRY_MARKETOS Feb 2, 2005 1:07 AM
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This is a known item. Under certain (entry) circumstances,
one of the internal models can cause a false warning message
to be set. This will be corrected in a future release of software-
the model itself won't change; the false setting of the warning
flag will be addressed.
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Local warning on coupled microstrip.

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