Error when simulating ridged conical horn in HFSS

[sayan4]

Hi i have a problem with HFSS.I'm studying a ridged conical horn using HFSS.I have drawn if and I have drawn the box where I have put antenna.When I have started simulation an error message appears
" [warning] Solution Setup 'Setup1': Given the specified frequency and model dimensions, an extremely large mesh will be required to produce an accurate solution. Your model and/or frequency units may be set incorrectly"

I have used a bandwidth that goes from 2 GHz to 9Ghz.
How can solve the problem?
Please help me.I'd like to know where I could find such articles about ridged conical horn and its simulation with FEM
Thanks and excuse me for my english,but I'm italian

 

[purushottam]

HFSS help

You can draw your model.then maybe some suggestion can be given.

 

[sayan4]

Re: HFSS help

this is my model

Added after 1 minutes:

Excuse me.How can I draw my model?

 

[anandrashi6]

Re: HFSS help

hi, sayan4
im getting the same warning as u...though my freq is 300GHz.Did u find out a solution to this problem...please suggest me