# Coplanar waveguide characteristic impedance

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#### pj83

##### Newbie level 5
Im trying to extract the characteristic impedance and attenuation of a coplanar waveguide using the scattering parameters, with ADS.

Ive made a lot of attempts, but i think that im missing some details.
The formula that im using are correct, because I`m using a textbook also, but I think that there is some problem concerning the complex nature of scattering parameters.

Formula are something like this :

e(-gamma*l) = (1-S(1,1)^2+ ...)^(-1)

Z = sqrt(Z0^2 * (1+S(1,1)^2...))

#### kspalla

when you have s-para then use s to z conversion to find char impedance.

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