Ansoft Hfss - Simulation results ?

Hi

I am simulating a tear drop antenna in Ansoft Hfss. I am getting a constant value of S11 over 5 GHz which is obviously a wrong result.

What could be the problem ?

Thanks in advance.

It could be caused by many things. It would be helpful if you post your design files here.

I am not able to upload my design file.

But I can give you the details, it is the design of a tear drop antenna.

I am getting the radiation patterns properly at different frequency points, whereas the s11 is not coming properly.

did you check the port assignment properly? sometimes these problems occur when ports are not proper.

Hi,

I have checked the port assignments and they seem to be proper.
I am getting reasonable results in ansoft designer though

then why not use the ansoft designer...it would be faster in simulating your condition

I have found that for designs involving curves , HFSS is much faster than designer. It took almost 3 days for my design to get simulated in designer.

first plz check your structure and then check the boundry conditions,

I dont think your radiation pattern might be correct, check your design.