Farfiled calcaulation error in CST

[snkhan]

I got this message form CST

"Parllel symmetry plane:NO farfield calculation possible"

What is the reason and how to resolve it.

Thanks

 

[Pushhead]

Please state the boundary conditions and setup of the model. Are there any periodic boundaries set ?

P.

 

[snkhan]

I guess this is what u require:
BTW I even check with without any boundry condition

1) Bottom is ground plane
3) All other boundry conditions are set to open (add space)

Althoug i manage to get the results when i change zmin not as ground but as open with add space.

You give me your suggestions

 

[plasma]

maybe the port is not in one of the Plan XY,XZ,YZ

PL

 

[Pushhead]

Check the backgroung material, if its an antenna model in free space it should be Normal material with ε=µ=1, i.e. Air.

P.

 

[snkhan]

I Got the problem, we need to use "add open space " instead of Gnd at Zmin
Regards

 

[adel_48]

but this will change the results in case your antenna is near the ground

 

[snkhan]

Hi adel_48:
Open Add spce is required in most of the Antenna (e.g verticle monople antenna, Vivaldi etc) simulation to get more accurate results.
You r quite write in saying that the results would change but the change will make them close to Meas.