antenna with substrate of large thickness

[sahar20]

I simulate an antenna with substrate of large thickness(more than 10mm at 10GHz), and use the infinite ground plane, and advanced extension port, so how can I set up the the port to avoid the warning " the substrate thickness factor for port is too big",and "the ground separation/length radio for port is too big", and could get the high simulation accuracy?

 

[nazanin]

The input impedance of the antenna is not uniquely defined when your port to ground (or reference) distance is more than 10% of a wavelength. In some sense, it is similar to solving the input impedance of a dipole antenna when the gap between the 2 arms is very big. You can not get consistent result because it is not a consistent value. You can get different value depending upon how you measure it.

 

[ie3duser]

Sounds like you are using IE3D.

I have found that utilising a finite dielectric and finite ground plane scheme can make that error message disappear. However your simulation run time will increase by 10 fold.