Hi
I designed a cylindrical cavity resonator but the structure is not resonating. I used the idea of microstrip line for excitation through two wave ports.
As another option for excitation of cavity resonator, I thought to place a patch of Copper on top side of cavity and this patch is given an inset feeding. But It did not work yet.
Please help me.
Thanks
What mode is used?
Do you mean dielectric resonator (not cavity resonator)?
Then this might help:
**broken link removed**
http://www.trans-techinc.com/products_detail.asp?ID=11&Name=Dielectric-Resonators
Where is your metal cavity? It is difficult to understand what you have designed. A hole in the substrate surrounded by smaller holes?
And your S-parameters look like a simple thru-line, not like a resonator, not like the structure that you have shown/drawn.
2) A cylinder of same dimension (diameter and height) as of hole, is drawn to model the air material inside cavity. The curved walls and bottom surface of it is selected as Copper (Finite conductivity). Is this correct modeling of metallic cavity?
3) Coaxial feeding is employed at the center of the cavity, however I am confused whether inner cylinder of coaxial connector should touch the bottom surface of cavity or should it be bit above the bottom surface?
I understand that you have no metal top cover.
Typically, the cavity is completely enclosed by metal (metallic box).
You want to create an electric field maximum in the resonator center. See diagram 2 here:
https://www.daenotes.com/electronics/microwave-radar/excitation-methods-of-cavity-resonator
S11 is almst approaches to zero, which is completely wrong.
Is it wrong?
I think this is what we expect for such a resonator: almost total reflection outside the resonance. At resonance, reflection depends on the coupling to the resonator: it might be too weakly coupled.
If you visualize the E field, does that look correct (desired mode?)
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