Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [s-parameters]

121 questions
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Reading S2P Files - What Does Each Column Represent

I'm having a hard time reading s2p files. For an example say that I am measuring the parameters of a 2-port network (port 1 and port 2). What do each columns represent? I can tell that the first column represents the frequency, but what about the…
Luxii
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S parameters of a capacitor

I am struggling to understand S parameters. As an example, I am considering the S matrix of a capacitor in series with a transmission line. It has two ports, so must be represented by 2x2 matrix. But the form of this matrix eludes me. I thought I…
NLambert
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How to pick a Push-Pull Transformer?

I have to admit up front this is a borderline shopping question. But the fact is I'm looking at an application note from Linear Technologies. That application note calls for Coiltronics CTX02-14659 for the isolating DC-DC transformer. What are the…
vicatcu
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How to compute S21 when port 1 and port 2 reference impedance (Zo) are different

The attenuator given in the figure is a 6 dB attenuator when both port 1 and 2 have a reference impedance of 50 Ω. Then, their S-parameter matrix (when port 1 and 2 have 50 Ω reference impedance) would look like $$S=\begin{bmatrix}S_{11} && S_{12}…
Emm386
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How do I convert S-parameters for impedance matching?

How do I derive the Z-parameters to calculate a matching network for a device? I'm not sure what terms to even search for as I get all sorts of information I am not familiar with. My task is to construct a matching network for the MRF1535NT1 FET…
SubZero
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S-parameter bi-section for deembedding

I've recently come to suspect the effects of connectors on my measurements. I'm looking at several different ways of de-embedding their effects from measurements that I take with a network analyzer (20-30 GHz). Here's the thru board I'm trying to…
Legen Diary
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S parameters calculation from VNA file

I am trying to validate that our broadband LNA(Low noise amplifier) is working correctly. I wanted to measure the S21 of the LNA, I calibrated the VNA for the specified frequency range and measured performed a measurement. The file that I extracted…
Dimitar Zhekov
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Which matrix index should be used when Y (admittance) is shown to compose a circuit segment mapped to an ABCD matrix? Y21? Other?

I would like to cascade a serial capacitor with a shunt inductor to form an L-match network by multipling two ABCD parameters and convert the result to S-parameters that represent the composite network. As a starting point, the capacitor's…
KJ7LNW
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Common mode choke - Why only impedance?

Why are most common mode chokes only given with a impedance curve, inductance at a specific frequency and current rating (this is clear). Wouldn't be S-parameter better? I know it's more work, but what can I calculate with the impedance? Thanks
R098
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Why do we use S parameters for channel modelling, rather then using Z, Y, h or any other parameter?

For channel modelling in high speed PCBs we always use S parameters. What is the specialty of S parameters for this purpose? Why we are not using Z, Y, h or any other parameter? How do we determine passivity and and causality from S parameter data?
Hari
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De-embedding ceramic filters

I want to design a diplexer using two ceramic filters. S2P files of the filters are not provided. Therefore, I designed a PCB which can be shown below to obtain their S2P parameters. In the first channel shown above, there is a BPF whose center…
Aldrich Taylor
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Bad Reflection from SMA Board Connector at 4-8 GHz

recently I have tried to design a simple SMA-to-microstrip connector PCB intended for 4-8 GHz. The connectors used are vertical with surface-mounted centerpin (link). The design idea was to simulate the connector and the transition to the microstrip…
Miomio
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How do I find the return loss of a transformer from its 4-port S-parameter data?

I'm looking for information on the performance of Mini-Circuits T16-1-KK81+ transformer. The transformer is well-characterized, Mini-Circuits provided both insertion/return loss charts and raw S-parameter measurements for download. I'm having…
比尔盖子
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F-parameters instead of S-parameters

What are the F-parameters, how are they computed in CST and what is the relationship between S- and F-parameters? In CST, they can be obtained, when running the integral solver and having a farfield-source imported. However, because I have no other…
user1797118
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Why is it so important that an amplifier is unconditionally stable?

When studying microwave/milimeter wave amplifier design, one often finds discussions about stability. Stability means that the amplifier will not generate signals by itself (except for noise). As we often find in microwave amplifiers that there is…
Joren Vaes
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