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Single Port Coplanar Waveguide Resonator for measuring reflection

Hi all,

I am trying to simulate a coplanar waveguide resonator and obtain the resonant frequency and Q-factor using RF module in COMSOL. I used the lumped port boundary condition and with two ports (with wave excitation ON for one of them), I get resonance at around 90 GHz. However, I want to simulate a CPW resonator with a single port, as experimentally I will be measuring the reflection (with resonance corresponding to a dip in Image may be NSFW.
Clik here to view.
).

When I remove the second port, I see no sign of resonance despite sweeping frequency from 2 to 250 GHz. Image may be NSFW.
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is always >Image may be NSFW.
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dB.

It would be great if someone could give some pointers about anything that I may be missing here!

Tl;dr: I want a CPW resonator with a single port to show a dip in Image may be NSFW.
Clik here to view.
indicating resonance.

Thanks!


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