Need help for finding -Radar Cross Section at 34.3GHz at CST

Hi,

I want to simulate and find RCS(Radar Cross Section )of some large objects (bigger than 2m^3)at freq=33.3-35.3GHz
at CST .
Because of the freq. range and the zise of the objects, i get this message from the CST:
"Unable to genrate mesh(mesh is too dense or calculation domain may have zero volume)"

How can i solve this problem?

I am a beginner at CST.

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