CST troubleshooting error

Hi all, I am trying to simulate a patch antenna using with a coaxial feed to the patch, the coaxial feed has a conductor, substrate and a shielding. When i place a port on it and run the simuation, i get the error that port 1 is completely filled with metal, I tried a suggestion on the forum to push back the electric boundary but it doesn't work hence would there be any other suggestion on what this error means? This happens when I am using the transient solver.

When I try to widen the port to see if it get rid of the previous error , another error saying waveguide for port number 1 is too short. Would anyone have any idea on what does this errors actually mean. Appreciate any help rendered.

Cheers

Pls post your project (.cst file). Difficult to tell you what's wrong just by reading the error description It could be that you have not set the background material. It should be set to normal.

Thanks for the help , here is the attachment it is in CST2010

Hi, spirited09 - to quickly solve your port error problem, go to global mesh propertiy and increase the mesh line ratio limit to say 50. Highlight coaxial_shielding and set local mesh properties to e.g. say dx:0.05, dy:0.05,dz: 0.5. These mesh settings may not be optimial (try your own to reduce simulation time) but should give you an example on how to prevent the coaxial shielding from forming a big block of metal due to insufficent mesh density. I also noticed that the bound box is "corrupted" when I open the file - I clicked on file and reslected the planar antenna tempelate and reset all the boundaries. But this may be due to a CST version difference. Hope this helps.

I get what you meant , will do and yup CST is backward compatible not forward can be a pain at times when reading other versions . Thanks again Element7k.

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