Theory about a special kind of resonator

[yefj]

Hello ,I have the following resonator Its very intresting.
I need to simulate it .Is there some theory regarding this resonator ? so i could control it and see which modes could be made from it?
Thanks.

 

[Baluncore]

The key to the mode of operation is the orientation of the end-fed, λ/4? coupler, between the hard-line coax, and the cavity.

By changing the dimensions, the performance could be moved from resonance to rejection. You would need to know the frequency of operation and the specific application before generating a model.

Where did you find it? Who made it? What party number?

 

[yefj]

Hello,I was given it to investigate without any details.
I got a mode where the H-field is which is going threw the hole of the "disk" and the E-field is surounding it
As shown below.The frequency of this mode is 7Ghz.
How do i controll the resonance frequency of this ode in such structure?
Thanks.