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Waveguide Wave port issues HFSS

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TheXander

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As part of a bigger project I am using a grounded CPW for a SIW in HFSS. I simply want to start with just making sure the CPW part works first before proceeding with the rest of the project so using a calculator I got the dimensions needed for a 50Ω characteristic impedance and proceeded to create my design. The issue that has me stumped involves the wave ports. I found the recommended dimensions for the rectangle but it throws an error for the wave port not being backed by a pec. I tried making my ports into thickened rectangles and assigned the excitations only to the faces facing into the waveguide and got no errors however looking at my S parameters I could tell I was not getting the correct results. Does anybody have any advice as how to fix this issue?

I am running modal simulations, the conductor is copper. I can provide any additional details as needed to find the solution.
 

PlanarMetamaterials

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Welcome TheXander,

Extend the CPW to the edges of the simulation domain, and apply the waveports there. Then, they won't need to be backed by a PEC.
 
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    DIJIA

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DIJIA

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Welcome TheXander,

Extend the CPW to the edges of the simulation domain, and apply the waveports there. Then, they won't need to be backed by a PEC.

Thank you for the reply. It is quite helpful to me. I have simulated a similar CPW device with waveports in Modal solution type. I set a rectangle the wave port. And I have a air box for radiation boundary with size lambda0/2, but the air box must touch the wave port, then touch the CPW and substrate under it. I wonder It is correct or not. thx~
 

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