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coaxial feed in CST MWS

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ok1987

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Hi guys,

I am designing a monopole with two cables attached to it. The ground plane is on top of the substrate and i'm hoping to feed the monopole by a coaxial feed from the bottom of the substrate. I have tried 'picking the face' of the bottom of the monopole and creating a waveguide port, however it comes up with the following message:
1. Thefirst three mesh cells within the region of port 1 seems to be inhomogenously filled.
2. Port 1 is inhomogenously filled within the first 3 mesh cells

I have attached a photo of my design. Any help would be greatly appreciated. Thanks.
 

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