Problem in CST waveguide port

[rajeshnatarajan]

Hi,
While simulating antenna structures in CST using wave guide port there is a error message "Wave guide port 1 is too short, it must be homogeneous for at least 3 mesh cells" how to improve the mesh cells to resolve this problem.....

I tried to create curve equation using macros for vivaldi antenna .but it is not working i am using spline option to create the curve.some body give solution for this issues.............

 

[Hadi-Alik]

Yes, Actually the physical structure of what you have connected to your wave port should be "homogeneous for at least 3 mesh cells". This is becasue you use a spline profile to create a port and the distance between two sides of your slot is changing continuously. I suggest connecting another peace of slot with a constant gap size to you tapered slot and then connect that to your wave port or to define such a tapering in you spline that gives you constant gap size at the end at least for 3 mesh. Is it clear?