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Box Dimension for CPW Resonator

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Firkin

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Hi,

I am trying to simulate a 2GHz meander CPW resonator in HFSS. My problem is that I am not sure what the dimensions of my box used to contain the resonator should be. I am wondering if anyone had suggestions on which dimensions I should use.

Thanks for you help!
 

Firkin said:
Hi,

I am trying to simulate a 2GHz meander CPW resonator in HFSS. My problem is that I am not sure what the dimensions of my box used to contain the resonator should be. I am wondering if anyone had suggestions on which dimensions I should use.

Thanks for you help!
Click to expand...


Run eigenmode?
 

Thanks for the response zhul. I tried running eigenmode but I was unable to tell which resonances were from the cavity and which resonance were from my TL line.

Thanks!
 

Firkin said:
Thanks for the response zhul. I tried running eigenmode but I was unable to tell which resonances were from the cavity and which resonance were from my TL line.

Thanks!
Click to expand...

I am not quite familiar with planar structure, but

As I known, CPW runs as quasi-TEM, the energy mostly gathered near the substrate, so the metal cavity should not affect the RF that much, which means unless your metal cavity has ridiculous dimenions, the lowest mode in eigenmode simulation should still be your working mode (Q-TEM).

Also, you can verify it by checking the electrical field vector distribution ( i always use this way to verify cavity modes), with or without cavity, the electrical vector should have the same direction, i.e. from center conductor to your ground conductors.

Hope it helps.
 

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