i need an urgent help in HFSS V. 9.0

Dear all,

I'm doing a simulation for a cylindrical cavity with 8-slots corrugated walls (magnetron cavity) on the HFSS V. 9.0 But unfortunately, I'm facing some troubles !

What I'm trying to get right now is to evaluate the resonance frequencies of this magnetron cavity and compare those resonance frequencies with the output of a Matlab code that i made.

The HFSS problem is an eigenmode problem, so i should put a solution setup before start the solution,

the setup parameters are:
1- the min. freq. that the simulation will start with.
2- max. no. of passes.
3- max. delta frequency.
4- converge to real frequency or not ( check box).
5- use free space lambda or not (check box).
6- use low order solution basis (check box).

THE PROBLEM:

1- The results are much different than the resonance frequencies of any cavity that can be calculated analytically (using basic microwave lows).

2- The results are much different than the resonance frequencies that are calculated by the Matlab code.

3- The HFSS results itself is very close , they seems to be the same mode !

I really don't know what to do ! this is my last step in my research but i cant go through. so please, if you could help, send me a reply soon.

Note: i will attach the model that I'm trying to solve, maybe you could help.

Thank you so much in advance.
Best regards to you.
Goher
m_goher@yahoo.com