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10th July 2019, 06:11 #1
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How to get s paramter from finite structure in HFSS? (metmaterial)
Hi guys:)
I'm using HFSS and I'm learning about this software
I'm studying in Metamaterial absorber.
as you know analysis for infinite array, we can use floquet port
but I want to analysis and get s parameter in finite structure like 13X13 array or curved structure
How can i get s parameter from curved surface or finite structure?

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10th July 2019, 15:26 #2
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Re: How to get s paramter from finite structure in HFSS? (metmaterial)
Welcome 1dbduddls,
I assume for an absorber the mode you're interested in is a freespace plane wave. For finite simulations, you pretty much always want driven modal simulations. In the case of the PW, you can use either a Floquet port, a standard wave port with PEC/PMC side walls, or an incident plane wave excitation.
Good Luck!

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11th July 2019, 05:21 #3
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Re: How to get s paramter from finite structure in HFSS? (metmaterial)
Thank you for answer my question
and Sorry for ask again
I made a structure and surround with region. and I assigned incident plane wave on top of the region
(plane wave setup
1. plane wave location : x=0, y=0, z=15 (because my region hight is 15mm)
2. Eo vector : x=1, y=0, z=0
3. k vector : x=0, y=0, z=1 (because i want to make wave direction top to bottom)
4. Analysis : solution frequency 13Ghz and Frequency sweep :8Ghz to 12Ghz+checked 3D Field wave option check box
)
After finished analysis, I can see the Field distribution but I can't find s parameter in Result
I know i'm doing silly question but Can you help me?

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11th July 2019, 15:39 #4
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Re: How to get s paramter from finite structure in HFSS? (metmaterial)
It's actually not a silly question: incident plane wave is probably the hardest to work with; because you have to calculate the scattering parameters yourself.
The easiest route from here is to replace the IPW with a wave port on the surface you have selected. Otherwise if you're set on the IPW:
a) Set up integration equations in the field solvers to integrate power over the "Input" and "Output" faces.
b) Using the Fields>"Edit Sources" menu, you can select between incident, reflected, and total fields.
c) S11 is just 10log(ReflectedPowerInput/IncidentPowerInput), and S21 is 10log(TotalPowerOutput/IncidentPowerInput).
Good Luck!
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