Characteristic impedance

snock · Jun 9, 2017

I am trying to simulate a CPW circuit in Momentum and I would like to know the characteristic impedance of it. Is it calculated by momentum from the ports? I have seen some simulations where a parameter appears as Z0 in the simulation, but it is not appearing always.

PlanarMetamaterials · Jun 9, 2017

Use LineCalc (or some other non-included tool). I don't think Momentum can do it directly.

pancho_hideboo · Jun 9, 2017

You can evaluate Z0 by open-short method.

snock · Jun 12, 2017

thank you both for the replies.

pancho_hideboo said:
You can evaluate Z0 by open-short method.

Is this a method of calculation for Z0?

BMR · Jun 12, 2017

If you have CLID package from ADS, you can calculate as well.

pancho_hideboo · Jun 12, 2017

snock said:
Is this a method of calculation for Z0?

Yes.

You can get {s11,s12,s21,s22} from Momentum.
Then convert {s11,s12,s21,s22} to {A,B,C,D}.
Here Z0=sqrt(B/C)

Characteristic impedance

snock

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snock

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BMR

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