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S parameters and boundary conditions for coplanar waveguide
Posted 6 apr 2021, 16:42 GMT-4 RF & Microwave Engineering Version 5.6 0 Replies
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Hello forum,
This is my first post, I hope to find some help for the design of my coplanar waveguide.
First of all, I am tasked to design a waveguide for an FMR experiment, and I am new to COMSOL, so I started by looking at the sma_connectorized example.
I then changed the dimensions of the PCB, and instead of the rectangular box of air I defined an air sphere, and set this as my scattering boundary.
Also I changed the lumped ports to Multielement.
Now my question is if the S parameters I got are actually correct. (S21 is green, S11 is blue, characteristic impedance at lumped port 1 is red) Another thing I would like to know is why there seems to be no electric field propagating on the surface of the conductor. Maybe I am missing something.
I will make changes to the geometry either way, like using metal for the vias, changing the spacing etc. but I just want to know if what I did until now needs to be corrected.
I would be grateful for any kind of advice.
Hello Aram Sajdak
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