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Antenna design CST

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Ziri

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Hello,

I'am trying to design a double Patch antenna with double polarization on coaxial feed and when i start the simulation with the Time domain Solver, I have an error that says

"Calculated mode propagation constant can not be resolved by mesh step. Please consider refining the mesh in the port region for port 1."
And also :

"Adaptive port meshing failed"
 

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