waveguide iris filter

Hello All,

I'm trying to design a waveguide iris filter in HFSS. I'm using the matthaei's design procedure for the design. When I try the design on mode matching software, the results are good but when I simulate it on HFSS, the results are no where close. I'm able to see three resonances (corresponding to 3 cavities) but the peaks are too small (-50dB) what am I doing wrong.

I'm attaching the HFSS file here, please help me

While recently reading a document from nera research on HFSS simulation, I cam across the following reference

Folger?, K. (Nera Research), Step-by-step procedure for design of waveguide filters with HFSS, Ansoft HFSS User Workshop, Los Angeles, January 2001

I could not find it anywhere. Could anyone please upload it here if they have it.

Thanks