Calculating Finite Thickness Impedance
The Assign DC Thickness option on the HFSS menu is enabled if at least one object contains a good conducting isotropic material (such as copper), and the Solve Inside property is not selected. If the object meets these conditions, you can assign a DC thickness. If the thickness of the layer is finite, the surface impedance is calculated as:
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(1) |
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(2) |
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(3) |
where
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(4) |
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(5) |
where h is the layer thickness.
Similar surface impedance is assigned to surfaces of 3D objects of good conductors, which are of NoSolveInside and Thickness for DC Resistance is set.