Help me calculate the reflection coefficient for P-band 3D waveguide

Hi, i got a problem in calculating the reflection coefficient for this P-band waveguide of dimension 15.8mm by 7.9mm

It is in 3D

Can someone pls help or send me a revelent program.....

Thanx!!!

Faced with this problem I would build and evaluate a model using HFSS.

I do not have a spare copy that I would be willing to send to you. I use the one I have for professional consulting. The cost is well beyond "spare change". Think of a Mercedes Benz or BMW automobile.

wat is HFSS???

Come on ..................

Try using the search feature on this site and also google and wikopedia before asking a question like this.

The answer is at your finger tips. Try whatI have suggested and if you still cannot find the answer yourself let this community know and someone will provide you with the answer.