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HFSS: gap source will be short circuited...

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trichop

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I make a model in HFSS where I use a lumport to feed a microstrip. The microstrip is placed in an empty conductive 3D ellipsoid.
1)After I start the analysis an error message appears saying:

The gap source will be short circuited by the conductors...

but I can't understand what it means, because when I simulate the microstrip alone, without putting it in the ellipsoid, everything goes well.

2)A warning pops as well, saying:

[warning] Solution Setup 'Setup2': Given the specified frequency and model dimensions, an extremely large mesh will be required to produce an accurate solution. Your model and/or frequency units may be set incorrectly.

could anyone help?
Thanks in advance.
 

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