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S-parameter model vs. RLC model

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VarunKumar89

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Hi all, could any one tell me why S-parameter model is better than RLC model ?
and where it is mostly used.

Thanks for help in advance..........
 

S parameters are used at VHF and higher. They are directly measured and are therefore exact. RLC parameters are used at HF and lower and in hand calculations. They give you a better feel for what is happening in the circuit.
 
At high frequencies, when the wavelength is comparable to the size of the component, the phase of voltage and current is not constant along the line or component.These are known as distributed components (coaxial lines,transmission lines, R,L and C at high frequencies).
So S-parameters are basically used to observe the behavior of the components at high frequencies. Where as RLC models hold good only for low frequencies (when wavelength is large compared to the size of the component..lumped component).

So if you are dealing with lumped components use RLC models. If you are dealing with distributed components use S parameter model.
 
can anyone tell me about the frequency response and phase response of s-parameters with mathematical formula
thanks for help in advance!!!!!!!!!!!!!!!!!
 

For a specific device the S parameters are given for usefull frequency range in form of a table. You can use curfe fitting software like CurveExpert to find formulas for absolute value and phase angle for each parameter.
Then: Sij(w)=Aij(w)*e^(j*PHIij(w))
 
Actually, any physical passive S-parameter model can be represented with an RLC network.
 

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