waveport problem in HFSS

[vacikel]

I made this waveport in HFSS but there are problems with it. It has a linear S11 which is totaly wrong.

can anyone help me?

I attached the project file

 

[jallem]

I dont think you setup the port properly. One
side of the port is PEC surface and the other
side is a dielectric with e=80. I think you need
to revise that.

 

[vacikel]

I totaly changed the geometry of waveport part now I see characteristic S11 of birdcage coil

thanks