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Spiral inductors, especially on IC??s, has often very small spacing between the turns. The thicknessof the trace is changing the impedance of the trace but also increases the coupling between turns.
Momentum assumes that all metal traces are infinite thin in the EM simulation. A first orderapproximation of modeling the thickness of the conductors can be done by adding an air layer tothe Momentum substrate setup. The thickness of the air layer is set to the height of the conductor.
Then map one layout layer on top of the Air layer and one below the Air layer. A via layer is thendefined to connect between these two layers. See Fig 3.
Note! Thickness of the metal layers are set to half of the thickness of the conductor.
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