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Calculating Resistance/Capacitance values from measured/simulated S-parameters

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musmanm

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Hello!

I designed a 2nd order bandpass Chebyshev filter in HFSS. I fabricated the sample and measured the s-parameters. Its a two port network and it should have R1, R2, C1 and C2.
I want calculate transient response of this filter and also the transfer function.

For that, I would like to get exact values of R1, R2, C1 and C2.

How can I extract these four values from measured S-parameters (recorded from VNA)? Or from the simulated s-parameters in HFSS?

Do we have any option in HFSS to extract resistance and capacitance values directly?

Thanks!!
 

There are numerous websites through which you can enter your filter parameters and it will find the Rs and Cs of your filter, moreover, you may also enter Rs and Cs values to get the transfer function and other features of the filters.
 
Its a two port network and it should have R1, R2, C1 and C2.
Click to expand...
But 2nd order Chebyshev is LC filter, isn't it? How should be represented by R and C only? Why four values?
 
FvM said:
But 2nd order Chebyshev is LC filter, isn't it? How should be represented by R and C only? Why four values?
Click to expand...


Yes it is LC filter. I am sorry for the mistake above.

The values of my Chebyshev filter are:

Center Frequency : 2205 MHz
Bandwidth : 60 MHz
Passband Ripple : 1.3 dB
System Impedance : 50 Ohm
Order of Filter : 2

--------------------------------------------

Element 1 , Orientation : series
C = 0.019 pF, L = 269.881 nH
Element 2 , Orientation : shunt
C = 35.16 pF, L = 0.148 nH

---------------------------------------------

These are the values I got from an online calculator.

I need to calculate the transient response and transfer function now. Can you please help me find a calculator for that?
 

Element 1 , Orientation : series
C = 0.019 pF, L = 269.881 nH
Element 2 , Orientation : shunt
C = 35.16 pF, L = 0.148 nH
Click to expand...
I do not know why it is called 2nd order because its transfer function is not a 2nd order.

Below is the transfer function. V1 = input voltage

 

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