What's the microwave S-parameter?

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In summary, the conversation discusses S parameters and their importance in RF devices. They are presented in polar or complex form and can be plotted on a Smith Chart to easily design circuits and matching networks. The conversation also mentions a free ebook on S parameters.
  • #1
iScience
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i haven't been able to obtain a simple answer
 
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http://www.microwaves101.com/encyclopedia/sparameters.cfm
 
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So its worth is "many times" 0?
 
  • #5
yes. I was being a bit silly. sorry!

jason
 
  • #6
jasonRF said:
Chapter 13 of this free ebook is on S parameters. Is a good book, by the way. Worth many times the price!

http://www.ece.rutgers.edu/~orfanidi/ewa/

That book's awesome! Thanks for posting!
 
  • #7
It is very similar to other port parameters like ABCD, Z, Y, etc. S-parameter deals with incidence and reflected power waves and the 2 port parameters are ##S_{11},\; S_{21},\;S_{12},\;S_{22}## and with certain condition like either the reflected or incident wave is zero etc. Keep that in mind, it's just another parameters.

Most RF device are spec with S-parameters. They are presented either as polar coordinates form where they give you the amplitude and the phase angle, or presented as complex numbers. You plot the parameters on Smith Chart and you can read out Z and Y parameters also. That will make it very easy to design circuits and matching networks.
 
Last edited:

1. What is the purpose of S-parameters in a microwave?

S-parameters, also known as scattering parameters, are used to characterize the behavior of a microwave circuit. They describe how the circuit will respond to an applied input signal, and can be used to determine important performance metrics such as gain, reflection, and insertion loss.

2. How are S-parameters measured?

S-parameters are typically measured using a vector network analyzer (VNA). The VNA sends a known input signal into the circuit and measures the reflected and transmitted signals at various frequencies. These measurements are then used to calculate the S-parameters.

3. What do S-parameters tell us about a circuit?

S-parameters provide information about how a circuit will behave in terms of signal reflection, transmission, and attenuation. They can also be used to determine the impedance of the circuit and identify any mismatches or losses.

4. Are S-parameters frequency-dependent?

Yes, S-parameters are frequency-dependent. This means that their values can change at different frequencies, which is why they are typically measured over a range of frequencies to fully characterize a circuit's behavior.

5. How do S-parameters relate to other circuit parameters?

S-parameters are related to other circuit parameters, such as impedance and admittance, through mathematical equations. They are also closely related to other parameters used in microwave circuits, such as reflection coefficient and transmission coefficient.

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