# Finding Z21 using HFSS

1. ## Finding Z21 using HFSS

I am trying to find the Z21 in HFSS for a modal of interdigital Capacitor which i have simulated. Can anyone tell me about Z21, Z12 parameter. Is it normalized to 50 ohm or not which HFSS is giving me? HFSS giving me img (Z21) = 63.154.
Please someone guide me. Thanks

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2. ## Re: Finding Z21 using HFSS

If you know S-Parameters, you can transform them into Z-Parameters by using well known equations.

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3. ## Re: Finding Z21 using HFSS

if i know Z parameter then how will i find the capacitance for interdigital capacitor in HFSS ?

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4. ## Re: Finding Z21 using HFSS

Originally Posted by Sabir8566373
if i know Z parameter then how will i find the capacitance for interdigital capacitor in HFSS ?
C(Farad)=1/{2*PI*Imag[(z11*z22-z12*z21)/z21]}

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5. ## Re: Finding Z21 using HFSS

Originally Posted by BigBoss
C(Farad)=1/{2*PI*Imag[(z11*z22-z12*z21)/z21]}

Thank you so much. You did a great help for me.
Can i please get the reference for this formula of C(Farad) ?? I will be grateful.

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6. ## Re: Finding Z21 using HFSS

Dear Sir,

Can you please tell me the corresponding reference/link to this formula;

C(Farad)=1/{2*PI*Imag[(z11*z22-z12*z21)/z21]} ??

Please share it with me because i also have to mention the reference while explaining it. I will be grateful to you.
Thanks

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