my master thesis is attached-it will work with a little help

Dear all,

I was able to make the attach file (which is a simulation of microwave oven) more efficient by changing the parameters.
It consists of two parts: waveguide and cavity.

If you investigate the waveguide and cavity seperately (one by one);
I have a efficient waveguide with -30 dB s1.
and my cavity itself has resonant dimensions at 2.45 GHZ.
They are both working good themselves.

When I connect them it seems they dont work.s1 becomes 0.
This is my problem.

I think I can overcome this problem by two ideas:
1-)To put a material inside the cavity that is able to absorb power (like a potatoe)
But i dont know the permittivity, permeability of it.
When i tried to put some material arbitrarily it seems that the s1 parameter makes some difference.I was able to get -1 dB instead of 0 which is again too high.
I try to get -10 dB at least.
Can anyone tell me what material to put inside the cavity to get a good result???
2-)The best mode that works with my system is TE 564.
I dont know how to tell HFSS to excite the waveguide by this mode.

can you help me about these two topics?

Re: my master thesis is attached-it will work with a little

this file is in .hfss format !!
how to open it. can you please mention any viewer for this format !! :|

you can open it using Ansoft HFSS

Re: my master thesis is attached-it will work with a little

Hi wickedweasel !!!

I didn't download your project but I've got an answer for the 1st one:
You need to put inside a water.
there are some reason for that ; mainly water have high dielectric loss(Epsilon''=80) and sea water have electric conductance of 4 S/m (fresh water have 0.05 S/m averagely).
(for general knowledge; potatos have epsilon'=57.3 and tan(delta)=0.27 - at room temperature and at 3GHz)

About the second quest. - How do you will physically excite the TE 564 mode ?

Hoped It helped.

Re: my master thesis is attached-it will work with a little

dear itzikhaim,

thank you very much for your interest to my problem.
For the first problem: I will try to put water inside.

For the second: I want to tell HFSS to excite the waveguide by
TE 564? but i dont know how to do it
do you have any idea?

Regards

Re: my master thesis is attached-it will work with a little

Hello again wickedweasel !!!

I thought you can handle this mode doing the following:
1. right click at wavePort1 (of your exictation menu in your project) choose properties
2. Go to Modes folder
3. Enter the number of modes ---> but it won't work because HFSS limits it to 25 modes.

I'm really don't know how to handle it.

Good Luck any way!!!

Re: my master thesis is attached-it will work with a little

dear itzikhaim
thanks a lot,
i will try it